Cleanup
Add simulation code to bow model

This is a duplication. There should be a better way to abstract this function into one that can be
used by any model. Maybe by passing functions around.
Add code to evaluate normal forms and sort results by similarity
Add simulation code for word2vec models
Add more presentations
sorted() is not a destructive function
Add gitignore
Ignore pyc files
Convert words to lowercase before computing vector.
Update dataset
Add Presentation 5