[GitHub] zeppelin pull request #2589: [DOC] 0.7.3 release note

[minahlee]

GitHub user minahlee opened a pull request:

    https://github.com/apache/zeppelin/pull/2589

    [DOC] 0.7.3 release note

    ### What is this PR for?
    Add release note for Zeppelin 0.7.3 and update download page.
    
    ### What type of PR is it?
    Documentation
    
    ### Todos
    * [ ] Update release date once vote passes
    * [ ] Update list of user helped rc verification
    
    ### Screenshots (if appropriate)
    Download:
    
![screencapture-localhost-4000-download-html-1505374123318](https://user-images.githubusercontent.com/8503346/30417214-ebc90536-9969-11e7-9cf2-416a084d8fc0.png)
    
    Release note:
    
![screencapture-localhost-4000-releases-zeppelin-release-0-7-3-html-1505374134405](https://user-images.githubusercontent.com/8503346/30417215-ebcb640c-9969-11e7-940c-4a1927abaa3f.png)
    
    ### Questions:
    * Does the licenses files need update? no
    * Is there breaking changes for older versions? no
    * Does this needs documentation? no


You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/minahlee/zeppelin doc/release-0.7.3

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/zeppelin/pull/2589.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #2589
    
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commit 017524d2ad229dd724e5e147b31ad5629e584f2b
Author: Mina Lee <mina...@apache.org>
Date:   2017-09-14T07:24:45Z

    Add 0.7.3 release note

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