Data::Rx::Manual::CustomTypes pod and example/

This documentation covers 3 worked examples showing different
facets on creating a type plugin.

The examples themselves are runnable, within the example/ directory
and come with a test.pl to demonstrate their use.

There are also some minor tweaks to the main Data::Rx documentation,
mostly to point at this new POD doc.
perltidy example code
perltidy pod
make room for version insertion
tweak for how podweaver weaves pod
v0.200006

        - big ol' pile of examples and docs! thanks, Hakim Cassimally!