### What is this PR for?
Groovy Interpreter
### What type of PR is it?
Feature
### Todos
* [ Tests ] - Task
* [ Documentation ] - Task
### What is the Jira issue?
[ZEPPELIN-2176]
### How should this be tested?
Follow the groovy interpreter documentation samples
### Questions:
* Does the licenses files need update? YES
* Is there breaking changes for older versions? NO
* Does this needs documentation? YES
Author: dlukyanov <dlukyanov@ukr.net>
Author: dm <dm>
Closes#2135 from dlukyanov/master and squashes the following commits:
faf213f [dlukyanov] ZEPPELIN-2176 comments from @AhyoungRyu - remove @author - remove commented code
89c3ed5 [dlukyanov] retry
ca65947 [dlukyanov] deprecated
3dd53e2 [dlukyanov] ZEPPELIN-2176 comments from @AhyoungRyu - Zeppelin follows Google Java code - interpreter alphabetical order in _navigation.html - direct link to MarkupBuilder in groovy help
fe08159 [dlukyanov] retry
ca8bea6 [dlukyanov] Update groovy.md
a5b37a1 [dlukyanov] ZEPPELIN-2176 https://github.com/apache/zeppelin/pull/2135#issuecomment-289308850 - Inside of docs directory, groovy.md will need some header to be compiled with Jekyll - Menu in docs also need link to groovy - .travis.yml we need add !groovy
4abf649 [dm] Merge branch 'master' of https://github.com/apache/zeppelin41a1702 [dlukyanov] ZEPPELIN-2176 https://github.com/apache/zeppelin/pull/2135#issuecomment-288829494 - implement shared script variables - move docs - implement run methods
dd388b3 [dlukyanov] retry
b34b42a [dlukyanov] retry
0d7732a [dlukyanov] retry
2646fa8 [dlukyanov] ZEPPELIN-2176 groovy interpreter, fix unchecked, add to configs, move HTTP.groovy to resources to simplify build, add default z-properties
5fa26e0 [dlukyanov] ZEPPELIN-2176 groovy interpreter, fix unchecked, add to configs, move HTTP.groovy to resources to simplify build, add default z-properties
aa427cd [dlukyanov] retry
addf167 [dlukyanov] retry
db4c35b [dlukyanov] Update README.md
fa779ea [dlukyanov] groovy interpreter
53a28a3a91