Merge pull request #301 from benjello/dev

Fix graph and setup
Merge pull request #303 from benjello/dev

Working on tunisie and fixing some typos
deleting use of numpy logical

all and, or and not are in pandas now
cleaner organisation of erf/step01

One day data might be more pythonic in a class and an organisation whit
what look like methods can't be bad
smal cleaning of erf.step02

TODO: translate stat match in python ?
Adding alr_decl and removing freq
some cleaning
Merge pull request #304 from Pyke75/dev

Adding alr_decl and removing freq
Modifying trannoy.py
Merge branch 'dev' of https://github.com/openfisca/openfisca into dev