ZEPPELIN-1027: Python - add basic matplotlib example notebook

[bzz]

What is this PR for?

It adds basic python matplotlib example notebook.

What type of PR is it?

Improvement | Documentation

What is the Jira issue?

ZEPPELIN-1027

How should this be tested?

New zeppelin notebook shows up in the list.

Screenshots (if appropriate)

Questions:

• Does the licenses files need update? No
• Is there breaking changes for older versions? No
• Does this needs documentation? No

[bzz]

I'm planning to add at least one more tutorial notebook of using python, something similar to what we have for Apache Spark but with pandas and matplotlib etc.

Do you guys think advanced one should be incorporated in here - 😕, or shall we have a separate one 😄 , say title "Zeppelin Tutorial: Python - pandas, matplotlib".

[minahlee]

I hope we have more example notebooks. Once we have a lot of example notebooks, it won't be efficient to keep all of them embedded in Zeppelin by default. I guess we will manage most of example notebooks on the website in the end. IMO better to separate them by usage so that user can find example notebooks easily on his demand.
And matplotlib example notebook looks good :)

[bzz]

Thank you @minahlee that makes perfect sense to me.

[AhyoungRyu]

Yeah 👍 for @minahlee. And it looks good! :)

[prabhjyotsingh]

Good one, we should have it. LGTM.

[bzz]

Thank you for prompt reviews!

Merging in master and branch-0.6 if there is no further discussion.

CI fails with node.js dependency install

[INFO] make: Leaving directory `/home/travis/build/apache/zeppelin/zeppelin-web/node_modules/karma/node_modules/socket.io/node_modules/socket.io-client/node_modules/ws/build'
[ERROR] npm ERR! Linux 3.13.0-40-generic
[ERROR] npm ERR! argv "/home/travis/build/apache/zeppelin/zeppelin-web/node/node" "/home/travis/build/apache/zeppelin/zeppelin-web/node/node_modules/npm/bin/npm-cli.js" "install" "--color=false"
[ERROR] npm ERR! node v0.12.13
[ERROR] npm ERR! npm v2.15.0
[ERROR] [ERROR] npm ERR! shasum check failed for /tmp/npm-9969-f242cd1f/registry.npmjs.org/multiparty/-/multiparty-2.2.0.tgz
[ERROR] npm ERR! Expected: a567c2af000ad22dc8f2a653d91978ae1f5316f4
[ERROR] npm ERR! Actual: 50d19b53ff3e86f1a5f2fad8b20ab8bdaeb6d9f5

and Integration tests been taken care of under #1034