test in additional environments with LC_ALL set differently
Refactor passthrough logic; add custom warning categories
send "unencrypted!" warnings to correct subcategory

...and turn them off in the "Maybe" tests.
update our cpanfile
drop and ignore t/gpghome/random_seed
document custom warning categories
update README.mkdn
v0.004

	* Refactor passthrough logic
	* Add custom warning categories
Full build of CPAN release 0.004