Print, but don't fail on deprecation notice

A simple change so that deprecation notices are printed, but don't cause test failures. A possible fix for issue #27.
This is great, though I wonder if checking the exact order in which the errors are printed doesn't couple too tightly to Puppet's implementation (which could change between now and the final 4.0 release). Could these last two `expect`s simply check that each error message (`The use of 'import' is deprecated` and `Deprecation notice:`) is present in the `res` array?