Created a new web worker to calc crime type totals, added underscore

- I thought I would use it for more, currently it's use is trivial
Added basic gitignore
Added crime totals to DOM which will become the legend

- added new bower dependency for Handlebars
Created a config object to store common values such as min/max zoom
Started to incorporate backbone into the project

- added Backbone as a bower dependency
Indented all declarations within MainApp object
Cleaned up some jslint warnings
Implemented the population of the model via backbone