Merge pull request #89 from otalk/getRemoteStream

don't blow up if getRemoteStreams is not available

rtcpeerconnection.js

@@ -117,7 +117,14 @@ function PeerConnection(config, constraints) {
         };
     }
 
-    this.getRemoteStreams = this.pc.getRemoteStreams.bind(this.pc);
+    if (typeof this.pc.getRemoteStreams === 'function') {
+        this.getRemoteStreams = this.pc.getRemoteStreams.bind(this.pc);
+    } else {
+        this.getRemoteStreams = function () {
+            return [];
+        };
+    }
+
     this.addStream = this.pc.addStream.bind(this.pc);
 
     this.removeStream = function (stream) {