Conflicts:
	pystache/context.py
	pystache/tests/test_context.py
	pystache/tests/test_renderengine.py
	tests/common.py

Testing that all elements in a dot-notation path are called (if applicable). Better repr for Attachable test class.

Auto-calling elements in the middle of a dot-notation path (reverts 3c5a6db5)

Conflicts:
	HISTORY.rst

The resolve() function is responsible for the interpolation name
resolution rules described in the Mustache spec.  Also, falsey values
are now coerced to strings using Python's str(), which is more in line
with the spec.

Tox now works with Python 2.4 through 3.2 and includes doctests and
spec tests in all environments.

Doctest discovery no longer depends on pkgutil.walk_packages().