Parse config as if it can contain multiple references to config files.
This allows you to pass in multiple config files from the command line
Helps with issues #514 and #703
By using $stdin adn $stderr instead of STDIN and
STDERR it is possible to capture or redirect them
using in process ruby code without the need
to manage pipes and external processes
Alex Kessinger
Parker Moore
Tom Preston-Werner
Christian Hellsten
Gregor Schmidt
Nick Quaranto