Merge pull request #1 from dlovell/master

add requirements.txt
Merge pull request #2 from dlovell/master

Skipt text description row
Functions to calculate durations for conversation data

Note that there are issues with the duration data that still have to be
worked out.
Added raw parsers and some tests for data

This is basically Kevin Wilson's stream of consciousness. Please feel
free to move things around.
Added placeholder directory for data
Adding a .gitignore
Updated README with installation hint for people
Added support for short years

There were a few dates that were short years.
Added xlrd requirement
Made munging/ a package