Cleanup of QuantEcon.py - November

[mmcky]

I would like to tidy up QuantEcon.py (thanks @oyamad for kicking this off). Please add any items re: maintenance of the repo below. I will then review this first week of November.

• review pip-requirements.txt for use and contents (used by readthedocs and documented in a new wiki page: https://github.com/QuantEcon/QuantEcon.py/wiki/Setup-and-Infrastructure)
• add documentation for generating CHANGELOG.md (this is currently in the wiki of this repository).
• update process to use CHANGELOG.md to document Github release notes (setup this page in the wiki https://github.com/QuantEcon/QuantEcon.py/wiki/Releasing-Versions)
• review .coveragerc
• review .coveralls.yml
• review .travis.yml

[oyamad]

• Remove unused data files from data

[oyamad]

• Test files other than those under quantecon/tests are not installed. For example, look into site-packages/quantecon/markov on your machine.
• Possibly related to the above and to the role of pip-requirements.txt, listing manually subdirectories here

  QuantEcon.py/setup.py

  Lines 97 to 104 in 35f41b1

  	packages=['quantecon',
  	'quantecon.game_theory',
  	'quantecon.game_theory.game_generators',
  	'quantecon.markov',
  	'quantecon.random',
  	'quantecon.tests',
  	'quantecon.util',
  	],

  does not seem really clever. Would packages=find_packages() work?

Thanks @oyamad I have updated to use setuptools (#515) and hopefully that will solve this issue.

[mmcky]

• update year in LICENSE.txt