Run a custom prepare script included in the app

If the project includes a deploy/prepare.sh script it will be run automatically preparing a custom package
Run a custom prepare script included in the app

If the project includes a deploy/prepare.sh script it will be run automatically while preparing a custom package.
Merge branch 'master' into prepare-script
Slightly more sensible sandbox customization
Merge branch 'experiments' into prepare-script

Conflicts:
	src/sandbox.sh
Merge branch 'prepare-script' into circuithub-deploy

Conflicts:
	src/sandbox.sh