alaashafaee/Coolsoft-14 — pull request #276 by ahmed93 (2014-04-20 15:23:48+00:00)
Title: Issue #273 changing img to profile_image in student, TA, Lecturer

@ahmedhagii @AhmedElassuty
- changing img to profile_image in student, TA, Lecturer ....
- changing integer "success" and "failure" to boolean "success" and "failure" with a default of false
- removing the uniqueness constrain on ids problem and student in attempts table
- adding relation has_many attempts in problem table