added allow_multiple_entries_per_date column to action categories
added allow_multiple_entries_per_date to student actions in seed file
[wip] setup ajax posting for activities via json (TODOs in comments
added data attributes to tags for js communication
added course ID data attribute for js communication
changed styling tag to match jquery and activerecord calls
added attr_accessible for allow_multiple_entries
implemented ajax post and get requests to persist attendance from database