Using ->meta->add_method requires Moose; do it ourselves

Unfortunately, Moo does not define a meta-class; if ->meta is called, it
bootstraps to Moose.  To avoid an implicit Moose dependency, swap to
doing the equivalent ourselves, using stash manipulation.
Reformat into standard Changes
Top-level directory cleanup
shipit wants to generate META.yml and not store it in git, so fine
Checking in changes prior to tagging of version 0.50.

Changelog diff is:

diff --git a/Changes b/Changes
index 78dcc10..630ff3b 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,10 @@
 Revision history for GnuPG-Interface

+0.50 - 2014-03-14
+ - Version 0.49 implicitly required Moose; switch to a technique that
+   does not
+ - Modernize CHANGES
+
 0.49 - 2014-03-13
  - Restore context-sensitive (array/arrayref) behavior of multiple array
    methods from 0.46.