[#233] Extended Project and Partnersite models and admin
[#233] Added migrations and warning to Project admin
[#233] Added warning message in Project admin
[#233] Changed permissions for pages not allowed to edit
[#233] Changed allow_edit flag to organisation level and updated permissions
[#233] Fix admin project list when org "owns" projects

Add filtering to the ProjectAdming.queryset() method that checks if the project is "owned" my another organisation than the user's.

Add UserProfile.allow_edit() method supporting the filtering above.

Refactor ProjectAdmin.has_change_permission() to use UserProfile.allow_edit()
[#233] Removed unused variables
Merge pull request #530 from akvo/feature/233_api_sync_flag

[#233] Sync projects and edit allow flag