Added student validations for name, birthplace, and birthday
Revised references to navigation checkpoints
Added comments for the old show and update method, for easy swapping during development
Added comments for the new show and update method, for easy swapping during development
Added missing `birth_city` and `birth_state` to student_params
Fixed Student form reference in student_name page
Fixed birthday validation
WIP display of validation errors on student name page
Disabled validation in old show and update methods in enrollment_controller
Added a flag `USE_NEW` in EnrollmentController to flip between old and new implementations (temporary, until new ones are complete)
Merge pull request #139 from codeforamerica/student-name-validation

"I Call Your Name" or Added student name, birthday, and birthplace validations