libhubbub-0.3.0-bp151.3.1

- Added patch:
  * libhubbub-0.3.0-is_error.patch
    + Avoid implicit declaration and undefined symbol "is_error"

- Fix RPM groups.

- Workaround false positive on powerpc64 (bnc#889740)
- added patches:
  * 0001-workaround-fail-on-ppc64.patch

- Cleanup with spec-cleaner

- Initial import of libhubbub, inspired by Fedora package
- Add patch to not store timestamp in package:
  * libhubbub-0.3.0-notimestamp.patch