Behat/Behat — pull request #408 by adlawson (2014-01-05 03:41:33+00:00)
Title: Error with a non-zero exit code

If the composer autoload file isn't available, write a useful message to `stderr` and return a non-zero exit code.

This stops CI environments etc. silently failing if the vendors aren't installed.
Granted, this isn't a likely situation, but better cover yourself than not.