Add first version of the API
Adds test data file
Fixes a bugfoot (generating an empty corpus name)
Adds a Makefile (clean, test, develop) + test reqs
Merges __repr__ tests in add_corpus/document tests
Adds setup.py and changes to be a  namespace package

Fixes #8
Adds temporary build directories to 'make clean'
Merge remote-tracking branch 'turicas/develop' into develop