reproducer and test for issue #20: filerev task doesn't work when using the same output file per two pages
Merge branch '20_filerev_two_files' of github.com:ppitonak/grunt-jade-usemin into ppitonak-20_filerev_two_files

* '20_filerev_two_files' of github.com:ppitonak/grunt-jade-usemin:
  reproducer and test for issue #20: filerev task doesn't work when using the same output file per two pages
improve test case output
Fix filerev multiple targets. Closes #20