use the schema's fully-qualified symbol in defschema's naming

This allows defschema to be used in conjunction with plumbing eager-compile. 
See [this closed ticket](https://github.com/Prismatic/schema/pull/104) on the problems caused when no qualificiation of the
symbol is done.

I tried using syntax quote to do the qualifying for me since that is it's job,
but I didn't have any luck using it with conjuntion with ~ and ' in this particular
case.  I'd love to see an alternative approach that uses syntax-quote if you know
how to do it. :)  

As is this appraoch works fine and solves the issue as outlined here:

https://github.com/Prismatic/plumbing/issues/38