Merge pull request #11 from isymchych/fix-audio-device-name

fix name of audio device

modules/RTC/RTCUtils.js

                 console.error('cannot enumerate devices: ', err);
 
                 // return only auto devices
-                callback([createAutoDeviceInfo('audioInput'),
+                callback([createAutoDeviceInfo('audioinput'),
                           createAutoDeviceInfo('videoinput')]);
             });
         });