customization-ready

This release adds documentation and the ability to customize the core stack mechanics of the library. New documentation can be found at the usual documentation spot, more specifically a new tutorial page for customization.

This release also fixes a number of minor compiler errors in side cases.

The plan for 3.0 is to wait for the C++ Committee to get itself together and decide on a Reflection scheme, and then ship automatic bindings with that. 'Till then, things are more or less stable now from all feature requests.