Merge for rebase
Remove unnecessary migration.
Merge pull request #386 from pulp/barnabycourt-package_publish_comps_xml

Add support for groups & categories to the yum distributor
Fix comps doctype/open tag inversion
Merge branch 'jconnor-new-yum-distributor' into jdob-nyd-metadata-publish

Conflicts:
	plugins/pulp_rpm/plugins/distributors/yum/publish.py
	plugins/test/unit/test_yum_distributor_publish.py