Fix problems where filename contains no extension (date paths end up like this) and change strrpos to check falsey correctly.
Force 'use' YAML value to be an array
Changed the Sculpin::EVENT_AFTER_FORMAT so that it returns a SourceSetEvent
Merge pull request #129 from WyriHaximus/master

Make Sculpin::EVENT_AFTER_FORMAT more usefull
Merge pull request #128 from jasonrhodes/force-use-array

Force 'use' YAML value to be an array
Revert "Force 'use' YAML value to be an array"

I really wanted #128 to be this easy but I'm running into other issues with it.
I need to revert this for now and will revisit. Thanks for the attempt,
@jasonrhodes. At the very least, you helped me track down where we can do some
of these things and helped me think through getting started. Much appreciated!

This reverts commit 56c655e1e94c40f3fc1a4052d3524d103579416c.
fixed various bugs
changing as per comments