Add some custom filters to help build the enrollment view that breaks up enrollees by letter ranges based on last name.  Create a new template html snippet that builds the list pagination, with options to display a way to delete or add each enrollee.  Added tests for new filters.
Merge branch 'develop' into feature/display_enrollees_in_name_buckets

Conflicts:
	add_people/templatetags/aptags.py
	add_people/tests.py
Fix lower range test.
Merge pull request #72 from Harvard-University-iCommons/feature/display_enrollees_in_name_buckets

Add some custom filters to help build the enrollment view that breaks up...