[GitHub] incubator-zeppelin pull request: R and SparkR Support [WIP]

[echarles]

Github user echarles commented on the pull request:

    https://github.com/apache/incubator-zeppelin/pull/702#issuecomment-202757005
  
    @jeffsteinmetz Thx for the review and inputs.
    
    - I have pushed a fix that shows `Success`(upper right of the paragraph) 
when the returned output is just empty.
    
    Regarding the list of interpreters in the setting page, I have investigated 
but not yet found a solution (just wonder if the issue is coming from this PR). 
Here are my findings which tend to show that registration of %r is correctly 
done:
    
    SparkRInterpreter is correctly registered in the logs
    
    ![screenshot from 2016-03-29 05 45 
00](https://cloud.githubusercontent.com/assets/226720/14100904/14581d08-f591-11e5-8f9e-9fabf8e1c8fc.png)
    
    REST call to the api correctly returns `spark.r`
    
    ![screenshot from 2016-03-29 05 44 
15](https://cloud.githubusercontent.com/assets/226720/14100932/41058822-f591-11e5-8201-5e9821fc1398.png)
    
    However, the list in the interpreter page is not populated with %r...
    
    ![screenshot from 2016-03-29 05 44 
31](https://cloud.githubusercontent.com/assets/226720/14100942/4cbbc122-f591-11e5-8fb4-894c743dcafd.png)



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