Add Ordering#reverse
Add Compiler#unsupported utility method.
Add support for negative page index in `page`
Simplify compilation of `page`
Improve NotSupportedError messages.
Add #to_s to Proxy, Leaf and Ordering.
Move Cesure to a `support` subfolder
Add an example file for `page`
Let compiled cog know where they come from.
Bump to next 0.14.0 version (broken APIs here)
Proxy delegates keys and heading.
Enhance testing of compiled cogs.