Remove lib/post-types.php and lib/metaboxes.php

We now recommend placing custom post types and
metaboxes within a plugin that contains all of
your site specific functionality.

See the latest update to https://github.com/retlehs/soil
to find an example:

https://github.com/retlehs/soil/tree/master/mu-plugins/base

CHANGELOG.md

@@ -1,4 +1,5 @@
 ### HEAD
+* Remove `lib/post-types.php` and `lib/metaboxes.php`
 * Make sure Primary Navigation menu always gets created and has the location set upon activation, update activation permalink method
 * Update to Bootstrap 2.2.1
 * Update conditional feed method