Few suggestions and issues with zeppelin 0.7.0

[Meethu Mathew]

Hi,


   - Its not possible to undo edits in a paragraph once its executed. But
   it was possible in 0.6.0. Is it purposefully removed or not?


   - Similarly, it would be great if there is a way to undo a delete
   paragraph.


   - When we edit a paragraph, an orange line appears in the left side of
   the paragraph, which is expected to disappear once the content is auto
   saved, but it exists even after contents are saved. Please correct it.


   - The documentation at
   
https://zeppelin.apache.org/docs/0.7.0/rest-api/rest-notebook.html#run-a-paragraph-synchronously
   says the sample json error as

                {

   "status": "INTERNAL_SERVER_ERROR",
   "body": {
       "code": "ERROR",
       "type": "TEXT",
       "msg": "bash: -c: line 0: unexpected EOF while looking for
matching ``'\nbash: -c: line 1: syntax error: unexpected end of
file\nExitValue: 2"
   }
}


            But it is  actually coming like
                     {  "status": "OK",
                            "body": {
                             "code": "SUCCESS",
                              "msg": [      {
                                           "type": "TEXT",
                                            "data": "hello world"      }
 ]  }}

I think its an issue in the documentation.

Regards,
Meethu Mathew