Shopify/batman — pull request #529 by hornairs (2012-08-19 00:30:23+00:00)
Title: Source folder changes and Proxy object

I apologize for the dual nature of this PR but I hope it doesn't matter cause both things are fine.

1 - move a bunch of classes which were at the root but not all that important/edited frequently into a folder called handy.
2 - Factor out a `Proxy` general class in the handy folder which `AssociationProxy` now subclasses. Useful for some stuff I'm doing in Shopify.

@jamesmacaulay @nciagra alright with you?