Merge pull request #54 from johnb30/master

Updating a few things and fixing PEP8
proposed contributors guideline
add content to contributor guidelines

This fixes a broken link, adds commit message guidelines, and references
the scikit-learn documentation.
fixes style consistency problem

the name "petrarch" should either be written as 'code' or not.
adds contributing guidelines to docs
Merge pull request #55 from zmjones/contributing

proposed contributors guideline
minor changes in a few places
Merge remote-tracking branch 'upstream/master' into minor
Remove print statements
One last time
Merge pull request #56 from johnb30/minor

Minor
making everything in synce
Merge pull request #58 from johnb30/master

Enabling article support and coref replacement
removes travis-ci, updates documentation

Since we have no tests, I removed the travis-ci yml file and the build
status indicator in the README. I also added a few links the the
README (a link to readthedocs, the eventdata website, and tabari), and I
updated the contributing guidelines to reflect that fact that we have a
dev branch now.
Merge pull request #59 from zmjones/cleanup

removes travis-ci, updates documentation
Merge pull request #60 from eventdata/development

Development
Fix README
Merge pull request #61 from johnb30/docs

Fix README