Added summary count for the end of the script
Stop tracking .gitignore
Removed some of the utility db functions from the createdb.py script and put them in enron.py so we can use them in multiple cases
Added doc strings
Added code to delete previously existing enron database before attempting to create it again
Merge branch 'master' of https://github.com/emsiepopples/kpmg1
scrubbing.py added which performs tokenization and stemming
Added code to compute collocations from a sample of the emails collection

Merge remote-tracking branch 'upstream/master'
Included a more elaborated collocations search including bigrams and trigrams.

TODO: Print the whole list of collocations. Currently both methods are run, we need to choose one and comment or remove the other.