Complete rewrite to use Plack Middleware.

Complete rewrite to use Plack Middleware.

Catalyst Plugin is bare minimum to load custom plack middleware via
setup_middleware
custom middleware based on Plack::Middleware::Static to serve static
content
existing test suite unchanged, except for 20debug.t, as there's no
$c->log now, it will use psgix.logger or warn/carp
Added Travis and Coveralls support.
Added ability to debug to psgix.logger
Updated changelog and added to contributors.
Bumped version to 0.32