Merge pull request #4 from evz/master

Pinning pymongo to a WORKING version
Merge pull request #5 from evz/master

Added some basic tools to get things going
Merge pull request #7 from evz/master

Adding a script to download all data and immediately shove it into Mongo
Merge pull request #8 from evz/master

Grouping rows from CSV files into smaller chunks before shoving them into Mongo
readme changes
Added unicsv to ensure that incoming csv is unicode
Merge branch 'master' of https://github.com/dssg/census-communities-usa
Explicitly declaring latin-1 encoding for geographic crosswalk table