Change Kiwi Xcode file template to use the name of the class you are tes...

Hi there,

New to the Kiwi framework, but am absolutely loving it! I made a slight change to the Kiwi file template to, hopefully, make it faster for people to generate new spec files. Xcode will now ask you for the name of your class/file you are going to test and then generates the spec file using that information.

I wasn't sure if you wanted to keep it more generic, but if so, maybe this update is a second Kiwi template?