Added a append and prepend to System, and removed pre_ and post_ build.
Added a append and prepend to System, and removed pre_ and post_ build.

 * People can define their own functions, as well as add any number of functions they want now. (Why did I not think of this?!)

Signed-off-by: Tres Walsh <6d279684697be182a0e83229177fc126bcf5026c@mnmlstc.com>

am0d/bit