filter warnings from gpg by default; watch for unencrypted files...

...and make it easy to subclass such that we can pass through unencrypted
files.
initial add: PerlIO::via::GnuPG::Maybe

A variant of PerlIO::via::GnuPG to allow for passing through unencrypted
files.
pod tweaks
add some basic ::Maybe tests to t/basic.t
autoadd
dumb down our comments...
POD/doc tweaks.
add the latest cpanfile
update .travis.yml

...to be super-special.  And work.  Hopefully.
...and travis again.
minor SYNOPSIS addition
explicitly set the 'raw' encoding on the GPG keyrings

...or Dist::Zilla dies horribly since 5.x
'decrypt' is correctly spelled!

...I think.
v0.003

	* Add PerlIO::via::GnuPG::Maybe
	* Additional tests, POD, mode changes
Full build of CPAN release 0.003