1)  Rest apis to export notebook as JSON
2)  Rest api to import notebook from JSON
https://issues.apache.org/jira/browse/ZEPPELIN-590

Author: swakrish <[email protected]>
Author: Ramaswamy Devarajan <[email protected]>

Closes apache#614 from swakrish/master and squashes the following commits:

83e7a6d [swakrish] Merge pull request #7 from apache/master
042d9af [swakrish] Merge pull request #6 from apache/master
f5b0805 [swakrish] Merge branch 'master' of [email protected]:swakrish/incubator-zeppelin.git
869b48f [swakrish] logging the error
f8bf1f3 [swakrish] Merge pull request #5 from apache/master
f8a992c [swakrish] Merge branch 'master' of [email protected]:swakrish/incubator-zeppelin.git
270e17b [swakrish] changed soureJSON to sourceJson
4cb69be [swakrish] Merge pull request #4 from apache/master
e282958 [swakrish] Changed websocket import to use common code
e928c14 [swakrish] changed doc to make it http post
4be62f6 [swakrish] Merge branch 'master' of [email protected]:swakrish/incubator-zeppelin.git
db6a580 [swakrish] changed HTTP Put to POST in the docs
ec14034 [swakrish] Merge pull request #3 from apache/master
630664c [swakrish] Merge pull request #2 from apache/master
b080d7d [swakrish] Merge pull request #1 from apache/master
db8b016 [Ramaswamy Devarajan] added note not found check for export
7351f31 [Ramaswamy Devarajan] Moved export/import methods to Notebook.java
6c19668 [Ramaswamy Devarajan] Changed http put to Http post for REST import
ecb8f1e [Ramaswamy Devarajan] Formatting for google style
9b64a66 [Ramaswamy Devarajan] fixed alignments
0e94dce [Ramaswamy Devarajan] add documentation
3645354 [Ramaswamy Devarajan] Rest Apis to export/import

### What is this PR for?
Enabling "Personalized Mode" for specific note

### What type of PR is it?
[Feature]

### Todos
* [x] - Backend work for supporting that feature
* [x] - Develop front-end UI

### What is the Jira issue?
* https://issues.apache.org/jira/browse/ZEPPELIN-1594

### How should this be tested?
1. config.personalizedMode = true in note.json
1. Navigate some jobs in two different browser

### Screenshots (if appropriate)

### Questions:
* Does the licenses files need update? No
* Is there breaking changes for older versions? No
* Does this needs documentation? No

Author: Jongyoul Lee <[email protected]>
Author: CloverHearts <[email protected]>
Author: CloverHearts <[email protected]>

Closes apache#1753 from jongyoul/ZEPPELIN-1594 and squashes the following commits:

a9d8f7e [CloverHearts] change mode name shared to collaboration and dialog message (#5)
70f68d8 [Jongyoul Lee] Fixed dynamic forms Fixed NPE while broadcasting userParagraphsMap
2c7bd39 [CloverHearts] broadcast bugfix
f59d26a [CloverHearts] implement update personalized mode websocket event in backend
9fcb7f8 [CloverHearts] implement ui
20425e7 [CloverHearts] add toggleNotePersonalizedMode and ui
4fabd88 [Jongyoul Lee] Fixed style
a7c91f1 [Jongyoul Lee] Fixed the bug while not using personalized mode
f627278 [Jongyoul Lee] Supported personalized mode