Renaming for clarity
Adaptation eipp for OF

Minor changes
Test of eipp data and OF

Does not run at that point....
Merge pull request #15 from MalkIPP/master

Ipp work on eipp data
Minor refactoring
Changes to tke car of openfisca-survey-manager dependency
surveys.py have been moved to openfisca_survey_manager
Change choi and sali to equivaent in taxIPP
Adding calibration module (WIP)
Move formula_couple builders to openfisca-core.formulas