Initial SPUD implementation.

Building on Windows is currently a pain and requires installing a bunch
of random programs. SPUD aims to provide a Simple PennMUSH Universal
Development environment, which provides automated toolchain and
dependency setup on Windows.

This initial commit implements basic checkout creation and updating, but
does not yet support toolchain setup, build file generation, or actually
building PennMUSH.

git-svn-id: https://pennmush.googlecode.com/svn/trunk@1899 ba372814-4f39-11de-9ad6-1127a62b9fcd