Remove models/roles and return to fat models

fix grack accessing files beginning with .git

Optimize query for keys of repository members

…to load them at once and then use query cache.

Get rid of skipping callbacks in production code. Dont trigger gitolite more than once on import in group

support for running in non-root directory/path (RAILS_RELATIVE_URL_ROOT)

Spelling error in merge request email

Fix spelling of 'assignee'