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.
An even cleaner way of handling the new logic might be to put it all in a "law_student?" method, making the final result:

...
isLawStudent: law_student?,
regStatus: campus_attributes[:reg_status],
regBlock: get_reg_blocks
}