Dropdown for how did you hear about program on student registration.

In student registration form, How did you hear about the program?
is converted from text area to dropdown containing specific
questions and also there is an option to student to enter
the answer in a text field.

BUG=https://code.google.com/p/soc/issues/detail?id=2224

Change-Id: I945aa18fb6a6d0d51ab666c2f89323c2ade7f678
8 files changed