Get buddies to load, make proxying work again in core

* Buddies now load in the buddylist: required moving oauth url permissions from the app to the extension (because the extension opens and reads chrome tabs)
* Proxying now works in the core of uProxy (by simulating UI actions using the JS console in the Chrome Extensions).  This required connecting the signalling channel to/from socksToRtc and rtcToNet

tested with "grunt test"