Add command for deleting all simulators
Add command for deleting all simulators

I find myself having to clean up my simulators too often. This lets me
just start fresh.

I might also make a quick script to create the default simulators I
actually want at some point. In the meantime I'm just adding a single
one in Xcode.

keith/dotfiles,keith/dotfiles,keith/dotfiles,keith/dotfiles,keith/dotfiles,keith/dotfiles