Rewrites the reset_simulator script as a bash script

We just keep having trouble with the AppleScript form of this
script.  So instead of using AppleScript to hit the simulator's
Reset Contents and Settings menu item we'll just blow away
everything the simulator stored in Application Support.
Rewrites the set_simulator_device script in bash

Rewrites the set_simulator_device script using bash so we can have
one less spot to potentially hit the weird AppleScript error on
Travis.