Taxonomy associations are handled during taxonomy registration
Functions are not hierarchical

Methods (which are stored as functions) have a post_parent, but not of
the same type so we should handle this is a custom fashion (just like
bbPress for example).

Removes `hierarchical => false` as this is the default.
Improve rewrite rules:

 * Remove feeds and static front
 * Plural archive URLs, singular item URLs
Better method URLs: /method/:class/:method/

Method post_names are now namespaced with the method's class. This
allows the method permalink to easily include the class name and it
prevents issues with duplicated method names.
Merge pull request #30 from joncave/improve-cpts

Better method permalinks and simplified CPT registration