Implemented server side forks
added ability to pass session to user/repo models

permission refactoring,
Implemented views for default permissions,
fixes #23 user registration is controlled by permission system.
Implemented manual registration option
websetup fills default permissions

rename repo2perm into repo_to_perm
added UserToPerm models for user global permissions

fixes issue #16 reimplementation of database repository, for using generic pk instead of repo naming as pk. Which caused to many problems.
Fixed issue when redirecting after repo name change to 404.
Removed update hook from basic app setup

Added new style error display,
fixed changing repo name to existing one
some sa session remove added
rename repo BIG bug, when renaming to existing name was fixed

repos crud controllers - change id into repo_name for compatability, added ajax repo perm user function variuos html fixes, permissions forms and managment fixes.
Added permission fetching for each request in AuthUser instance