Merge pull request #1 from gbzero/master

viendo que hace esto
modificado para refrescar el collection
commit
Merge branch 'master' of https://github.com/gbzero/project_teachers into gbzero-master

Conflicts:
	app/views/comments/_form.html.erb
lalal
Merge pull request #3 from hectormoreno/master

se updatea el collection con el otro collection en los comentarios