templates.py should search up the directory tree for templates directory

[granders]

This will make it possible for sub-packages to use template files without having to duplicate template files within subpackages.

I ran into this issue while creating a sub-package to hold a related group of services. In order to use template files, I had to then duplicate some of the files into another 'templates' folder within the subpackage.

[ewencp]

:+1: I'm running into this writing some muckrake tests.