adding avatar to projects
Created by: Popl7
adding avatar to project settings page added avatar removal show project avatar on dashboard, projects page, project page feature and rspec tests added
TODO: see if the avatar must be shown on other places design improvement? new default no_project_avatar image
EDIT: I just added icons from the repositories. They can be of type png, jpg or gif. These are overruled with an uploaded avatar. And there is a separate default icon for when no custom one is available. (just as indicator; can be made nicer ;-) Tests for the repo icon must still be added.