Change script.sh to match name change in splash
Failed version no longer terminates without output

Existing code relied on a nonzero return from grep, but `set -e`
means the whole script terminates in that case.
Give shorter instructions to install xcode CLTools
This is stupid.
I get it.
Revert "This is stupid."

This reverts commit 3c28050b08717d5283df81b5fc7c5d0d8e44a1e4.
Add dumb fix
Add message for script/hello_world
add existing-boxen warning to runner