ruby: add rubygems customization, fix postinstall

This configures rubygems to install all gems into a public, non-versioned
directory by default - both gems and their binaries. (This means that
users no longer need /usr/local/opt/ruby/bin in their PATH.)

This means that we no longer have to monkey with gem directories at all
in postinstall. Bundled gems will be symlinked into this location.

Fixes #29982.
Closes #29986.
ruby: set site_ruby and vendor_ruby at build
ruby: update 2.1.2_2 bottle.

Closes #30129.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>
Updates MD5Deep

The source code packages have been moved from Sourceforge to Github, which is reflected here. The way of building of the source code has also changed, which should be executed successfully here.

Please note that because of the way the source code build has been modified between 4.3 & 4.4 there are new dependencies involved in the build.

SHA1SUM updated as well.
Update MD5Deep

Should fix the whitespace problem declared by the Homebrew build bot.
Fixes my mistake.

I made a basic syntax mistake. This should fix my basic syntax mistake.

*Over to you bot. Please don't fail me this time*.
Update MD5Deep

Updates MD5Deep. The bot *should* approve this build. (Hopefully).
Update Md5Deep.rb

Trying to appease the build bot.
Update MD5Deep

Homepage update.
Update Md5deep

Should fix the one remaining whitespace error as referenced by the bot [here](http://bot.brew.sh/job/Homebrew%20Pull%20Requests/11998/version=lion/console).
md5deep: add 4.4 bottle.