Allow user to set custom STUN server in UI.
Replace core.iceServers with core.webrtcPcConfig
Allow custom RtcNet configs + show confirmation.
Merge remote-tracking branch 'origin/dev' into lucyhe-stun_config_in_ui
Use same STUN server for socksToRtc and rtcToNet.
Add support for Polymer core elements.
Add core-icons to bower.json.
Allow user to reset STUN servers to default.
Change setStunServer logic.
Merge remote-tracking branch 'origin/dev' into lucyhe-stun_config_in_ui
Fix comments + remove unused code.
Buddylist styling
Reset extension icon when app reconnects.
Update test to check for icon change.
Update const variable names.
Merge with dev
Add images to status bar
Merge pull request #621 from uProxy/dborkan-ui

Buddylist styling
Added socksRtcPcConfig & rtcNetPcConfig variables.
Merge branch 'dev' of https://github.com/uProxy/uproxy into lucyhe-stun_config_in_ui