Merge pull request #178 from mkaring/1.4

Refactoring Nifty 1.4
don't bind LibGDX-Desktop examples at integration-test phase anymore

This made the examples automatically execute in a "mvn install" call.
This has now been disabled. You can still run the examples manually with
"mvn antrun:run".
Collections.emptyIterator() is 1.7 API but we don't want to give up 1.6

We don't want to give up 1.7 compatibility right now but
Collections.emptyIterator() is Java 1.7 API. For now we've made our own
replacement. If we finally switch over to 1.7 we can use
Collections.emptyIterator() directly.