Added a cythonized cosine similarity to the repo, with tests and mods to the setup routines
Implemented optimizations for the cosine distance in cython; now down to 1us from 14
Added a class version of the cosine function to permit pickling with the settings file save functionality
Modified the patent example to include tfidf canopies and generate the right cluster IDs in the output.
Merge pull request #105 from markhuberty/patstat

Add tfidf cosine similarity and update patent example to use it appropriately