Adds missing docstrings
Adds __eq__ and __hash__ to Corpus and Document
Adds Corpus.documents() method
Adds license
Adds sample code on README
Merge remote-tracking branch 'turicas/develop' into develop

Closes #11
Fixes Corpus docstring
Add CHANGELOG file
Change setup.py's version to 0.1.0
Adds @flavioamieiro to list of authors
Adds MANIFEST.in
Merge branch 'release/0.1.0' into develop
Adds add_documents
Adds `add_documents` to README; updates it to mkd
Updates CHANGELOG
Updates version to 0.1.1
Merge branch 'release/0.1.1' into develop
Removes code that does not make any more sense since the REST API is in place

This code parsed the html response from PyPLN and extracted data from there.
Since the response is now a well formated json, this code is not needed
anymore.
Adapts the corpus creation method to use the new REST API
Returns the response content (as a dictionary) from PyPLN.add_corpus