Add unit tests for examples

@smarterclayton This is what I meant in the above (hidden) comment. The above import fixes the following error:

`examples_test.go:55: Unexpected error while decoding example JSON file 'guestbook/template.json': No type 'Route' for version ''`

I can't explain why it tries to load "" version instead of "v1beta" for the following Route resource https://github.com/openshift/origin/blob/master/examples/guestbook/template.json#L31, though.