beginning support for reference field in enrollment page
added support for new dropdown in enrollment form, and corresponding crm activity
changed unit test to find potential by id, which is cheaper
changed test name to reflect change in function name
improved crm tracking of lead source at enrollment
strict improvement to the api; added a function to update potentials
added crm functionality to tf_utils
added full support for the How Did You Hear About Us field in the enrollment form
Merge branch 'master' into self-serve-signup

for the release of the 'how did you hear about us' field in the enrollment form.