mac-syphon: Add "Allow Transparency" property

Transparency is now disabled by default, so that alpha values from
injected back buffers don't propagate to OBS (e.g. Minecraft doesn't
render properly in OBS unless "Allow Transparency" is disabled)
Remove ingest server live-ord.twitch.tv from services.json

Server doesn't exist anymore
https://api.twitch.tv/kraken/ingests
http://blog.twitch.tv/2014/09/service-update-chicago-point-of-presence-closure/
Merge pull request #289 from Gol-D-Ace/remove-twitch-ingest-server

Remove ingest server live-ord.twitch.tv from services.json