- add site post_render hook, which was documented but wasn't being
called
- define documents post_init hook, which was documented but caused an
error when called (fixes#4102)
- add docs for site post_read hook, which was being called but wasn't
documented
- fix container name in example: s/post/posts/
- hooks are registered to symbol owners rather than classes directly
- during registration, add the ability to specify owner as an array to
register the same hook to multiple owners
- add optional priority during registration as a symbol (:low, :normal,
:high)
- implement hooks for collections as they are in octopress-hooks, aside
from post_init