* Added maintainer selection on project page (see TODO in sources);
* Added `actual` field to BuildList::Package;
* Added rake task to set BuildList::Package.actual field.
Run it after migration (see TODO in sources);
* Packages after publising of BuildList becomes actual;
* Added MaintainerPresenter to avoid long method chains.
Changes includes:
* Changed Collaborator model;
* Autocomplete now works through backbone;
* Changed autocomplete styles;
* Groups have their own avatar;
* Changed previous backbone scripts;