Updated Feed Controller to have pagination and implemented most endpoints
for the FeedController.

Partially implemented Popular List in FeedController.

Updated LikeController to work with JSON AJAX requests.

Updated MessageController to work with JSON AJAX requests.

Updated Like and Message models, added fillable and visible attributes.

Updated the account.post view to correct verbiage on the submit
button.

Updated DOM for message.listItem view to have tighter markup.

Added AJAX Submit JS for message post form.