Build electron for Linux, Windows and macOS. Ref. #18, #19, #20, #22
Include gns3server in electron app. Ref. #21
Bumping version Ref. #24
CD and Release for AppVeyor, CircleCi and TCI. Ref. #25, #26, #27, #28
Make lighter artifacts #31
Build gns3server for Linux, Windows and macOS. Ref. #33, #34, #35
