Tree performance improvements

Merge branch 'feature/dashboardfeed' of https://github.com/alexleutgoeb/gitlabhq into alexleutgoeb-feature/dashboardfeed

Conflicts:
	app/decorators/event_decorator.rb

API for project snippets listing

Reversed order of progress indication so that the text matches the progress bar.

Tiny fix to the add/edit groups form path field

Doc fix: Nginx init script requires sudo

performance and security fixes

Apparently it didn't get removed after the rename to ExtractsPath.

This reverts commit 187e192c.

[ci skip]

make devise controllers use devise layout