Correct simulation for seniors.
Correct url.
Add tests.
Merge pull request #1 from stanislasrybak/master

Add tests.
Delete file
Merge pull request #2 from stanislasrybak/master

Delete file
Remove redundant samples and add sample with axes.
Update to new API.
Add notebook that shows OpenFisca variables list.
Adding R directory
Modified R files
Working example in R