dist directory from cli

Hey Mike,  have a look.  I'm passing the dist arg from the stdin to the img crawler and logging the results.  I tried to write a test, but something is wrong with gently (I think).  State from previous tests are being carried over to the next.  So for example, passing the dist in argv in test 1 and then not sending it in test 2 still seems to pass the dist arg from test 1.  I'm not sure what's going on there.

Raul