upgrade Ember and Handlebars template compiler to support query params

Switch bower.json back to pointing to a version of Ember instead of a commit as soon as a stable version of Ember supporting query params has been released.
add pagination to bottom of projects page

This makes use of pagination as defined in the [CfA API](http://codeforamerica.org/api/)
rename NavView to ActiveIndicatorView
Merge branch 'pagination'