refactor demand explosion out of utils and into models
(refactoring made possible by tests)
a little cleanup
add test of R&D planning
and fix bugs exposed by test
add webtest and django-webtest to requirements.txt
refactor process_selections
and fix bugs exposed by tests
more refactoring
Merge remote-tracking branch 'upstream/master' into jython

Conflicts:
	valuenetwork/valueaccounting/tests/__init__.py