Do not deploy when GIT_NAME is not defined.

This should stop deployment when Travis is run on forks.
Ookay. Even if this sounds really stupid -- if this is the TEST then where is the CODE?

P.S. I was wondering about the '=' but since I don't know Ruby..... ;-P

Sorry, I was trying to be helpful. So I now know how to write a test for what I want (probably the post in the issue (not pull request, sorry) is a passable test, actually) but where does the code go?