mojombo/jekyll — pull request #1098 by parkr (2013-05-13 19:15:11+00:00)
Title: Crash if a specified config file isn't there

If a configuration file is specified via the command line but does not exist,
fail loudly and crash to preserve the current state. Do not fail if the requested
file is the default configuration file, `_config.yml`. In that case, fall back on
the defaults.

//cc @benbalter @mattr-