Refactor the project

[berggren]

Refactor the project

This issue will track the overall progress of a big re-factor to the project. There will be a couple of sub issues tracking individual steps in the re-factor, but when each of these sub issues is done they will be merged into this re-factor branch. And when all is done and the master branch is reviewed the re-factor will me merged into master.

Some highlights

• Move from Django to Flask
• Move from Django ORM to SQLalchemy
• Move from Tastypie rest framework to flask-restfull
• New ACL system
• New annotation system
• Better test coverage