Add unit tests for examples

I already included 'pkg/latest', see line 13. But if I remove Line 16, I get error `examples_test.go:55: Unexpected error while decoding example JSON file 'guestbook/template.json': No type 'Route' for version ''`

The only way to fix this would be to include `_ "github.com/openshift/origin/pkg/api"` in the 'pkg/latest'.
Is that correct? Or am I missing something?