adding 2.3.0 release notes
add: catalog model object and manager; cataloger plugin support.
docstring.
docstring.
correcting the documented permission required for sync and publish
995076 - make sure to call finalize on the nectar config object
Merge branch 'master' into jconnor-995076-nectar-ssl-cleanup
added finalize to unit test
fixed index
Merge pull request #725 from pulp/jconnor-995076-nectar-ssl-cleanup

995076 - make sure to call finalize on the nectar config object
changes per PR review.
add a ton of missing plugin api tests.
add missing mock_plugins.reset().
prevent content_catalog.id from being indexed.
Merge pull request #722 from pulp/cataloger-plugins

Cataloger plugins
- Add support for alternate content sources.
fix unit test.
add remaining unit tests.
docstrings.
Merge remote-tracking branch 'origin/mhrivnak-exec-perm' into pulp-2.3