Added comment model and comments table to db
Added has_many through relationships to models
Removed "through" component of relationships.
Added comment functionality and display on task pages
Formatting of display comments
Added a "delete" button to the edit task page
Added user assignment list to the task index page
Merge branch 'master' into Jen

Conflicts:
	app/views/tasks/edit.html.erb
fixed merge conflict
generated migration
migrated order column to tasks table