GitLab support

I left the octicons from the cdn, because i know how to load a local file just for chrome. 
GitLab is working, adapters change based on an adapterManager that returns the correct adapter.
There are some minor hiccups while moving through a gitlab repo, sometimes the whole page reloads, and atm it loading from cache / live data takes a few seconds, i think it has something to do with jstree, i'll check these days.