MIME error, and add ability to pass args to child modules

The second commit is to fix a MIME error with your email implementation.
http://www.mimevalidator.net/ confirms you need an extra blank line or body text continues to be processed as headers.


While the naming childrenWithArgs is horrible, php does not have a good way to mix an array and associative array in one structure .  In order to maintain backward compatibility this method seems cleanest to me.  

Anything that adds the ability to pass args to child modules.