Closes Issue #6:

    - Refactors the rain series `$resource` to use cached json data.
    - Adds a python script that queries the NOAA Web Service for data for each state in the topojson file.
    - Commits partial NOAA Web Service data.
Merge branch 'master' of https://github.com/theopak/drought.io
Minor: consolidates use of `us.json`.