initial commit for moving student from one course to another

At this point we can successfully move a student's survey
submissions from Source course to Destination course if
a survey event using the same template is already created in
the destination course. More work has to be done for mass import
and to include functionalities such as enroling the student
in the destination course as well.
included form validation and data check to courses move

Since the form data does not get saved directly to the database we
cannot use the cakephp validation. I have instead checked that all
five fields have a selection (all required). If even one is missing,
the user will be redirected back to courses/move with a message
saying that all fields are required.

I have also included a check to see if a submission has been made to
the destination survey already. If a submission has been made the user
will also get an error message saying that the student seleted has
already submitted the survey.

Minor change: instead of using find in the move function, I have
changed them to use functions that are from their respective
models.
finished implementing the basics for moving students' surveys

The "Move Student" button is only available to "move" the selected
student when a select fields are not empty.

I have also included an option for the user to choose whether they
want to move or copy the student. To move, it means that the survey
results would be "cut and paste" to the destination course's event
and the student would be unenrolled from the source course. If the
copy option is selected a copy of the submission and inputs would
be made with the destination's event id. For both choices, the
student would be enrolled to the destination course if not already.