We've started to require this in reviews, so we should really have
automation in place to catch it right away.
Change-Id: I43fd90647acba400cea11c665fb587856514b0ee
This will provide a place to put checks that catch common errors
in elements. To start, this just checks that files starting with
a shebang are chmod +x so they can actually be run.
Change-Id: I4116a8f38f7bdfc5866764354c459fad8ca18e92