Change SlugRock to SlugRock-master

GitHub creates a SlugRock-master.zip with a SlugRock-master folder in
it.
Change SlugRock pointers to SlugRock-master.
Change SlugRock to SlugRock-master in command line

Change SlugRock to SlugRock-master in command line.
Because GitHub creates a SlugRock-master.zip instead of a SlugRock.zip