Merge pull request #3 from stanislasrybak/master

Add mor exemple (with boostrap).
Add graph of dependencies for formulas.
Remove Hackathon alert.
Add pages to render OpenFisca variables and formulas.
Add link to variables pages from API.
Correct links.
Add consumers to variables.
Add type and enumeration labels to variables.
Add link to source code in GitHub.
Add more variable properties.
Comment out doc (already present in source code).
Add survey_only attribute to variables.
Add support for alternative formulas (age & agem).
Merge branch 'master' of github.com:stanislasrybak/openfisca-web-site into stanislasrybak-master

Conflicts:
	openfisca_web_site/templates/site.mako
Use pkg_resources to find biryani1 location.
Merge pull request #7 from stanislasrybak/master

Delete the directory to biriany.
Merge pull request #8 from stanislasrybak/master

Add documentation for GNU/Linux.
Begin to integrate Angie CSS.
Center images in carousel.
Add date to visualizations in carousel.