Major Purge !! Dropped course, syllabi, specialization and board tables

Also, one step away from making the School table redundant.
Sektions are now tied to the teacher and not the school

retaining only the minimal structure that makes sense to everyone.
Old tables were too specific for the Indian school market context
More purging. Removed references to specialization and courses from the models
Purging still
Removed school_id and klass from student model
Trimmed school model. Need only name, country and zip-code info
redundant method removed
Sektions don't need to have klasses. That is oh-so-yesterday
Renamed :atm_key -> :uid in Quiz
Changed :atm_key -> :uid in Quiz. Should have been part of last commit
Removed reference to specialization
Removed reference to klass where not required (quiz, sektion etc.)
Merge branch 'sektions'