Add column, methods, and script for Learner reindex by cron
Merge branch 'add_search_update_flag' into single_search_box

Conflicts:
	app/models/learner.rb
Missed making new value whitelisted
Merge branch 'add_search_update_flag' into single_search_box
Merge pull request #241 from extension/add_search_update_flag

Add search update flag
Merge branch 'master' into single_search_box