Closes issue #1456 This PR adds a single sign on option to the login form, exposes single sign on to the end user, and allows an admin user to set single sign on configuration options.
* API client to create and get an app license
* Fixes unhandled promise rejection errors in redux config
* License Page and Form
* Adds getLicense action
* Adds License key area to App Settings Form
* Use license.token instead of license.license
* Implement API client
* Adds key icon to License Form
* Adds License Success component
* Render License Success on License Page when there is a license
* Adds persistent flash actions and reducer to redux
* Adds nag message middleware
* Moves FlashMessage component to flash_message directory
* Adds Persistent Flash component
* Renders Persistent Flash component from Core Layout
* Adds Kyle's styles
* Change license validation message
* Finishing touches for app config form license area
* Handle revoked licenses
* License Page hits setup endpoint
* Display server errors on license form
* Changes 0 allowed hosts to unlimited
* Trims JWT token before sending to the server
* GET setup page after submitting license
* add a js validator that makes smtp server port required
* specifying that the InputField should be a number. this doesn't work, but i think that it should.
* casting the port as an int as a stop-gap fix
* email doesn't already have to be enabled to be enabled
* don't return the smtp password from the API
* show a fake placeholder password if the username is also set
* error type for @groob
* AppSettingsPage at /admin/settings
* Adds App Settings to site nav items
* SMTP not configured warning
* Creates AppConfigForm
* Avatar preview
* API client to update app config
* Creates OrgLogoIcon component
* Hide username/password when no auth type
