Revert "CYB-245 Remove students controller"
Merge pull request #144 from ets-berkeley-edu/revert-140-remove_student_controller

Revert "CYB-245 Remove students controller"
CYB-247, git 1.7.1 does not support rev-list --count so we use wc -l
Merge pull request #145 from johncrossman/CYB-247

CYB-247, git 1.7.1 does not support rev-list --count so we use wc -l
CYB-251 "Likes" not being scored

 * previous implementation depended on the record being created already existing
 * gets the poster's canvas ID from the Attachment or MediaUrl model instead.
 * in the spec, the after_create will overwrite the specified gallery_id so an update
    is done on that attribute
Merge pull request #146 from coyote/credit_being_liked

CYB-251 "Likes" not being scored