SKIL-4: Added model for teachers
SKIL-4: Added migration for teachers
SKIL-4: Added FactoryGirl for teachers
SKIL-4: Added spec for teachers model
SKIL-4: Controller moved to api/v1/, updated routing

Based on sg-skil-4-all-teacher-profiles
Added teachers and show action
Merge pull request #11 from lukezbikowski/lz-skil4-all-teacher-profiles

skil-4 teacher profiles
Added Shoulda
Added association User<->Teacher
- Added shoulda Gem
- added user_id to teacher
- Associated user<->teacher
- Fixed test belonging (description)