Handle hashtags mention and stock symbols

Also add a test for parsing MAC files
treat URLs as single words
Changes to shingling regex and normalization
move normalization code to a separate method
convert to lowercase after HTML un-escaping
add some comments
move BNMI function to main module, add tests
Update one of the clustering tests
Add impermium tagging to output
Make script that processes the MAC log away from test suite
add a comment describing how to run the script for processing MAC logs
Set width and bandwidth directly
small refactor
Merge pull request #2 from escherba/dev

Merge from dev