Merge pull request #231 from jsantoul/dev

Debugging the files 05,06 and 07. Created util file.
Fixing a TODO in france.utils
Merge pull request #232 from benjello/dev

Fixing a TODO in france.utils
Fixing a pb with preproc
Fixing non-updating action_button when changing a paremeters bareme
Merge pull request #233 from benjello/dev

Minor bugs
Merge branch 'dev' of https://github.com/openfisca/openfisca into dev
Renaming various objects

files renamed to better reflect their function.