Uses GCDWebServer to serve local reloader files.

The reloader uses an internal WKWebView for load an index.html
that load the socket.io JS client lib and connect to the
reloader server. Due to a bug/feature of WKWebView that was
introduced in XCode 6 - beta 4 local files cannot be run.
Fixes compilation error due to WKWebView API change.
Adds local ruby version 2.1.2 with rbenv.
Updates pod to version 0.34.1 and project to XCode 6.0.1.
Remembers server address in example project.

The server address that was entered by the user in the example
app is stored in NSUserDefaults every time the user press
the connect button.