Fix tests with numpy expressions
Fix wrong expression
Revert "Use nose assertions for richer error messages"

This reverts commit 9f21e6d638d160353ce1628741d7709dc81d8151.

Conflicts:
	openfisca_france/tests/test_from_taxipp.py
Use assert_equal
Use hanging indent
Use flake8 hang-closing param
Add Makefile for tests and code coverage
Factorize tax_benefit_system in tests.base, clean imports
Use yield in test
[AL] Fix bug d'arrondi sur le forfait de charges