Add a helpful function for removing *.orig files.

This is especially helpful from within git repositories, where
after non-smooth merges and/or rebases you're left with *.orig
files hanging around all over the place.

Sure, there's options for merging to not keep backups in git, but
sometimes, if you're using custom mergetools they either don't
honor this setting or even worse, the mergetools themselves may
be the ones producing them!

YMMV.

In any event, my mergetool situation leaves me with *.orig files
and so this is an awesomely handy command for me.
Alias git with g.

I don't know why I ever resisted doing this sooner!

Check out my GitBashScripts repository for how to enable tab
completion in conjunction with just g!