Separate parent post and parent comment relation

Fixes #330

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2349 f69abe3c-2ee2-4550-9a6d-17bd458115be
Use defined filter priorities for endpoint registration

This should make it easier to register endpoints at certain points if desired.

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2350 f69abe3c-2ee2-4550-9a6d-17bd458115be
Add better taxonomy support

Fixes #275 for now.

git-svn-id: http://gsoc.svn.wordpress.org/2013/rmccue/trunk@2351 f69abe3c-2ee2-4550-9a6d-17bd458115be