Put POD back into .pm files

Metacpan displays the .pod files as separate documentation instead of
associating them with the .pm package.
Depend on Encode version 2.24

Discovered by Andreas König using statistical analysis. Closes
https://rt.cpan.org/Ticket/Display.html?id=95888.
Generate Getopt::Args in Makefile.PL

This gets rid of make-getopt-args which was a (non-portable) shell
script that I was running from a Git commit hook. This process broke
with my new release script. Closes
https://github.com/mlawren/p5-OptArgs/issues/10.
Fix up broken Changes file syntax
Release version 0.1.11_1 (2014-06-10)
Unset release date
Start development on version 0.1.12