remove unused category summary
move to queries for summaries
move away from multiple objects
no more course summary class
unwind model abstraction
further remove Arel Helpers
unwinding summaries from helpers
move Summaries back to user_summary
Move user summary tests.
complete move back to UserSummary
move to user.summary over instance var
remove summary helper
Standardize summary usage and memoize result
move logic out of views to stop setting locals
Merge branch 'kill_summaries'

Conflicts:
	app/controllers/users_controller.rb
	app/models/user.rb