Started working on choropleth example
Split up CSS and JS files for Choropleth example
Implemented single var pattern for Choropleth
Removed use of d3.map, replaced with JS object.
Updated Choropleth to use require.js
Used model.js to solve issue of waiting for two data files to load in Choropleth
Split up enter, update and exit phases for Choropleth
Split choropleth from main file. Added to div rather than body
Moved data loading from choropleth.js into main.js
Separated topojson computation from visualization logic