Add heatmap code and update source files to pass jshint settings
- Create new Shareabouts heatmap plugin
- Update HeatCanvas layer to resize the canvas when data is set
- Update Gruntfile to build the right min files
- Update source to pass jshint
- Split out Django CSRF code into it's own file that's not linted
- Delete unused main.js
Add dist files for easy download
Remove moment as a dependency, but use it as a global if available
Bug fixes in heatmap.js
Update Grunfile to make dev versions (copies) of our files