Updated grunt file to copy over favicons when building
Updated bower to include nvd3 dependency
Added nvd3 library to common.js file
Don't show data card when clicking on an image link
Attempting to speed up grunt build
The Big Viz Update

- Visualizations are now full-fledged objects saved
  by our data store and attached to each data dairy.
- Added Viz API.
- Added "sampling" API to sample data for viz.
- Updated viz rendering code to use nvd3 & d3.
Added django-admin to DEBUG instances to easily
create/delete objects when testing