Added isLawStudent flag to /my/badges API

Used `MyAcademics::CollegeAndLevel`  to detect is user's primary college is "School of Law," then stored result as `isLawStudent` within the `studentInfo` badge. Added RSpec test to verify working correctly.
There's another case of empty feed this code should handle. When Bearfacts::Profile gets an empty xml doc it'll return feed[:empty] = true. Your spec should cover that empty xml case too.