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Amos Elb d5e87fb8ba R Interpreter for Zeppelin 
This is the initial PR for an R Interpreter for Zeppelin.  There's still some work to be done (e.g., tests), but its useable, it brings to Zeppelin features from R like its library of statistics and machine learning packages, as well as advanced interactive visualizations.  So I'd like to open it up for others to comment and/or become involved.

 Summary:

- There are two interpreters, one emulates a REPL, the other uses knitr to weave markdown and formatted R output.  The two interpreters share a single execution environment.

- Visualisations:  Besides R's own graphics, this also supports interactive visualizations with googleVis and rCharts.  I am working on htmlwidgets (almost done) with the author of that package, and a next-step project is to get Shiny/ggvis working.  Sometimes, a visualization won't load until the page is reloaded.  I'm not sure why this is.

- Licensing:  To talk to R, this integrates code forked from rScala.  rScala was released with a BSD-license option, and the author's permission was obtained.

- Spark:  Getting R to share a single spark context with the Spark interpreter group is going to be a project.  For right now, the R interpreters live in their own "r" interpreter group, and new spark contexts are created on startup.

- Zeppelin Context:  Not yet integrated, in significant part because there's no ZeppelinContext to talk to until it lives in the Spark interpreter group.

- Documentation:  A notebook is included that demonstrates what the interpreter does and how to use it.

- Tests:  Working on it...

P.S.:  This is my first PR on a project of this size; let me know what I messed up and I'll try to fix it ASAP.

Author: Amos Elb <amos.elberg@me.com>
Author: Amos B. Elberg <amos.elberg@me.com>

Closes #208 from elbamos/rinterpreter and squashes the following commits:

ffc1a25 [Amos Elb] Fix rat issue
a08ec5b [Amos B. Elberg] R Interpreter
2016-04-05 16:35:18 +09:00

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<!--
~ Licensed to the Apache Software Foundation (ASF) under one or more
~ contributor license agreements. See the NOTICE file distributed with
~ this work for additional information regarding copyright ownership.
~ The ASF licenses this file to You under the Apache License, Version 2.0
~ (the "License"); you may not use this file except in compliance with
~ the License. You may obtain a copy of the License at
~
~ http://www.apache.org/licenses/LICENSE-2.0
~
~ Unless required by applicable law or agreed to in writing, software
~ distributed under the License is distributed on an "AS IS" BASIS,
~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
~ See the License for the specific language governing permissions and
~ limitations under the License.
-->
<!-- NOTE: This was taken and adapted from Apache Spark. -->
<!-- If you wish to turn off checking for a section of code, you can put a comment in the source
before and after the section, with the following syntax: -->
<!-- // scalastyle:off -->
<!-- ... -->
<!-- // naughty stuff -->
<!-- ... -->
<!-- // scalastyle:on -->
<scalastyle>
<name>Scalastyle standard configuration</name>
<check level="error" class="org.scalastyle.file.FileTabChecker" enabled="true"></check>
<!-- <check level="error" class="org.scalastyle.file.FileLengthChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="maxFileLength"><![CDATA[800]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<check level="error" class="org.scalastyle.file.HeaderMatchesChecker" enabled="true">
<parameters>
<parameter name="header"><![CDATA[/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.SpacesAfterPlusChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.WhitespaceEndOfLineChecker" enabled="false"></check>
<check level="error" class="org.scalastyle.scalariform.SpacesBeforePlusChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.FileLineLengthChecker" enabled="true">
<parameters>
<parameter name="maxLineLength"><![CDATA[100]]></parameter>
<parameter name="tabSize"><![CDATA[2]]></parameter>
<parameter name="ignoreImports">true</parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.ClassNamesChecker" enabled="true">
<parameters>
<parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.ObjectNamesChecker" enabled="true">
<parameters>
<parameter name="regex"><![CDATA[[A-Z][A-Za-z]*]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.PackageObjectNamesChecker" enabled="true">
<parameters>
<parameter name="regex"><![CDATA[^[a-z][A-Za-z]*$]]></parameter>
</parameters>
</check>
<check level="error" class="org.scalastyle.scalariform.EqualsHashCodeChecker" enabled="false"></check>
<!-- <check level="error" class="org.scalastyle.scalariform.IllegalImportsChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="illegalImports"><![CDATA[sun._,java.awt._]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<check level="error" class="org.scalastyle.scalariform.ParameterNumberChecker" enabled="true">
<parameters>
<parameter name="maxParameters"><![CDATA[10]]></parameter>
</parameters>
</check>
<!-- <check level="error" class="org.scalastyle.scalariform.MagicNumberChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="ignore"><![CDATA[-1,0,1,2,3]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<check level="error" class="org.scalastyle.scalariform.NoWhitespaceBeforeLeftBracketChecker" enabled="false"></check>
<check level="error" class="org.scalastyle.scalariform.NoWhitespaceAfterLeftBracketChecker" enabled="false"></check>
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<!-- <check level="error" class="org.scalastyle.scalariform.NullChecker" enabled="true"></check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.NoCloneChecker" enabled="true"></check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.NoFinalizeChecker" enabled="true"></check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.CovariantEqualsChecker" enabled="true"></check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.StructuralTypeChecker" enabled="true"></check> -->
<!-- <check level="error" class="org.scalastyle.file.RegexChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="regex"><![CDATA[println]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.NumberOfTypesChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="maxTypes"><![CDATA[30]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.CyclomaticComplexityChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="maximum"><![CDATA[10]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<check level="error" class="org.scalastyle.scalariform.UppercaseLChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.scalariform.SimplifyBooleanExpressionChecker" enabled="false"></check>
<check level="error" class="org.scalastyle.scalariform.IfBraceChecker" enabled="true">
<parameters>
<parameter name="singleLineAllowed"><![CDATA[true]]></parameter>
<parameter name="doubleLineAllowed"><![CDATA[true]]></parameter>
</parameters>
</check>
<!-- <check level="error" class="org.scalastyle.scalariform.MethodLengthChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="maxLength"><![CDATA[50]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.MethodNamesChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="regex"><![CDATA[^[a-z][A-Za-z0-9]*$]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.NumberOfMethodsInTypeChecker" enabled="true"> -->
<!-- <parameters> -->
<!-- <parameter name="maxMethods"><![CDATA[30]]></parameter> -->
<!-- </parameters> -->
<!-- </check> -->
<!-- <check level="error" class="org.scalastyle.scalariform.PublicMethodsHaveTypeChecker" enabled="true"></check> -->
<check level="error" class="org.scalastyle.file.NewLineAtEofChecker" enabled="true"></check>
<check level="error" class="org.scalastyle.file.NoNewLineAtEofChecker" enabled="false"></check>
</scalastyle>
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