Remove personal configuration scripts

Getting nitpicky here, but...well...sometimes that happens. There are at least four personal configuration files in our tree:

* hobu-config.sh
* hobu-windows.bat
* mpg-config.bat
* pramsey-config.sh

IMO those don't need to live in the tree. If folks need to store/version their configuration scripts, maybe they could use a gist coupled with exclude patterns in `$GIT_DIR/info/exclude`?