Use startWithPort instead of the runWithPort

[runWithPort] (http://cocoadocs.org/docsets/GCDWebServer/2.4/Classes/GCDWebServer.html#//api/name/runWithPort:bonjourName:) it's intended to be run with command line tools

Instead of runWithPort I've changed it to use [startWithPort](http://cocoadocs.org/docsets/GCDWebServer/2.4/Classes/GCDWebServer.html#//api/name/startWithPort:bonjourName:).
Also I get this error using runWithPort
```
from server.rb:8:in `on_launch'
	from delegate_interface.rb:5:in `applicationDidFinishLaunching:'
2014-06-16 22:31:50.697 ApexTest[15961:70b] *** Terminating app due to uncaught exception 'NoMethodError', reason: 'server.rb:53:in `start': undefined method `runWithPort' for #<GCDWebServer:0x8e2ee00> (NoMethodError)
	from server.rb:8:in `on_launch'
```