Improve model of account
Improved model of College
Improved model of Teacher
Improved model of course
Added a relationship between Clip and Account
Update model of course
Improved model of Question and Answer
Fixed bugs.
Merge pull request #9 from shonenada/improve/models

Improve/models
Split Account into User and SzuAccount
Update manager.py
Move relationship.
Added enumdef
Merge pull request #10 from shonenada/improve/model-of-account

Improve/model of account
Rename columns
Update manager.py
Added fixture.py
Merge pull request #11 from shonenada/feature/fixture-for-test

Added fixture for test