Minor update to your cucumber-jvm-geb-example repo

Hello, I found your cucumber-jvm-geb-example on github and found it very handy. It was nice and simple, relied on Maven (which I needed), and didn't rely on the now-defunct "gmaven" project like many of the other examples I found. 

I've updated the pom.xml to have the newest versions of most everything, including having to change the groupId for Geb. However, I haven't yet figured out Cucumber. In version 1.1.1 they moved all public interfaces from "cucumber.X" to "cucumber.api.X" but merely changing those definitions didn't seem to work. I'm new to Groovy so haven't yet puzzled out the errors it produced. 

I think your great example will benefit from the update, even with Cucumber's minor caveat.