Integration webrtc with xcode project.

How to use AppRTCDemo:

• Open AppRTCDemo in your xcode 6.1.
• Build and run AppRTCDemo.
• Open https://apprtc.appspot.com on Chrome in pc.
• Enter room id into textfield in AppRTCDemo. And then press join key.

Build webrtc:

• In order to build the webrtc, please see the instruction at http://ninjanetic.com/how-to-get-started-with-webrtc-and-ios-without-wasting-10-hours-of-your-life/.
• Report new webrtc issues at https://code.google.com/p/webrtc/issues/list

I use webrtc r8144 in this sample project.