+ Use HTTP::Headers for input/output headers. Add appropriate unit tests.

+ Make it easier to override classmetadata via template_args
+ Maypole::Application now creates a per-instance config() making it easier to run multiple Maypole apps in a persitant environment like mod_perl
+ Add missing items from Changes
+ Add beerdb.db to MANIFEST.SKIP

git-svn-id: http://svn.maypole.perl.org/Maypole/trunk@308 48953598-375a-da11-a14b-00016c27c3ee