Stubbed out a benchmarking script.

Usage:

tests/benchmark.py 10000

Changed make_template_name() from a function into a method.  Moved
the search_dirs argument from a Locator constructor argument to
an argument of Locator.locate_path().

Now the class no longer has an indirect dependency on the Reader class.

This further trims down the View class.

This branch contained some refactoring to move some of the View
class's loading logic into the Renderer class.  This will help
going forward as we change the Loader class.