Add a little script that automates creating files

Cause I don't like to know what date it is our how to title-ize things or remembering which markdown extension we're using.

This script when run as `bin/dmca Some DCMA title` will create the file 2012-09-26-some-dmca-title.markdown. If you have the VISUAL environment variable defined (say as vim, mvim, or subl) it will even open it in your editor for you.