make Connection test only run in node

...since it doesn't make sense for the browser

test/test.Connection.js

@@ -23,13 +23,16 @@ describe('Connection', function() {
     var c = new Connection(mSocket, mPeer);
     should.exist(c);
   });
-  it('should create a proxied socket if instructed', function() {
-    var mPeer;
-    var c = new Connection(null, mPeer, {
-      proxy: { host: 'localhost', port: 9050 }
+
+  if (typeof process !== 'undefined' && process.versions) { //node-only tests
+    it('should create a proxied socket if instructed', function() {
+      var mPeer;
+      var c = new Connection(null, mPeer, {
+        proxy: { host: 'localhost', port: 9050 }
+      });
+      should.exist(c.socket);
     });
-    should.exist(c.socket);
-  });
+  };
 });