be noisy when build or tests fail

exit with correct status

In particular, returning !build && !test means that we return 1 if both steps
succeed and 0 otherwise, which is definitely wrong.

allow missing directories

fix missing dep rebuild yikes

run tests automatically

don't generate corrupt arcs

fix misleading func name

clean up test files

license -> apache

license and such

Wall, Wextra, -v arc

document a bit

it work :)

initial commit