Support for generating an MD5 of a String.  Added to the String class so that we don't have another brand new class just for this (only used with strings, so makes sense anyways).  Tested result with Google Hash and they match up.  md5 class added from Double Doodle as-is there.
Merge pull request #158 from 24BitGames/LFL-LOOM-MD5String

Support for generating an MD5 of a String.  Added to the String class so...