Adding a project manager role
Adding tests and fixing broken done/validated per project
Prevent admin to remove privileges of oneself
Adding key for project manager
Remove dependency on angular
Merge pull request #159 from hotosm/project_manager

Project manager role
First round for a migration script.
Don't check for first user but for first admin user instead
Some adaptations
Don't care about lock. Better performance.
Project creation date taken from first modification
User ids are big ints. Update project_id sequence.
Fixing wrong merge
Fixing wrong merge
Flake 8
Don't check change in db filters