Gemify point_in_time library
Merge branch 'master' into gemify_point_in_time

Conflicts:
	Gemfile.lock
	vendor/plugins/point_in_time/lib/point_in_time/point_in_time.rb
Fix error in Gemfile.lock from merge
Merge branch 'master' into gemify_point_in_time
Update to rails 3.2
Merge branch 'master' into gemify_point_in_time
Update .gitignore to ignore tags file
Add cache-busting headers
Remove cruft
Remove deprecated memoization code
Fix bad links