Rename AgesCol to AgeCol. Add formulas for age and agem (from birth).
Correct indent.
Add SciPY dependency.
Try to use Debian packages of NumPy, SciPY, Pandas & PyTables with Travis.
Forget using Ubuntu versions of Pandas and SciPY: They are too old.
Add enumeration to type_sal column.
Typo.
Remove DEBUG_COTSOC.
Use OpenFisca-Core formulas without overriding them.
Removing alert when inverting cho and rst

Chonet is not a monotonic function of chobrut
Starting work on taxe d'habitation
Sort imports.
Rename Formula calculate to function. Rename prestation to column.
In columns, rename _default to default, _dtype to dtype & _func to function.
Add AlternativeFormula (for age & agem).
Remove commented code.
Merge branch 'master' of https://github.com/openfisca/openfisca-france