Implemented setting of AUTH_COOKIE after login, and removing when logged out. This cookie will be parsed by nginx later on, and if it is okay, user will not have to log in to all previewized.com previews
Implemented projects ACLs

- Each project now needs to have developer added
- Many-to-many relation (one dev - many projects, one project - many
  devs)
- Authentication cookie for available projects is set
Project auth token removed
Fixed edit and show templates, to support developers
Implemented Dummy VCS for development
Added project slug, removed obsolete fields
Merge pull request #41 from ajgon/cookie-auth

Cookie auth