Merge pull request #9 from jsantoul/master

Debuggin test_ga and cohorte.py.
Fixing tax proj aggregate method
work done 25/04/2013
Merge branch 'master' of https://github.com/openfisca/ga
Merge pull request #10 from benjello/master

Fixing jsantoul work
new files w/ utils
small cahnge of test_ga
Merge branch 'master' of https://github.com/openfisca/ga

Conflicts:
	src/scripts/test_ga.py
Work on nose to be completed