getUserMedia constraints: Allow `sourceId` (rather than just `deviceId`) to make adapter.js happy (should fix #282).
getUserMedia constraints: Allow `sourceId` (rather than just `deviceId`) to make adapter.js happy (should fix #282).

eface2face/cordova-plugin-iosrtc,BasqueVoIPMafia/cordova-plugin-iosrtc,eface2face/cordova-plugin-iosrtc,BasqueVoIPMafia/cordova-plugin-iosrtc,eface2face/cordova-plugin-iosrtc,hit0907/cordova-plugin-iosrtc,hit0907/cordova-plugin-iosrtc,BasqueVoIPMafia/cordova-plugin-iosrtc,hit0907/cordova-plugin-iosrtc