Update gem dependencies
Update D3.js documentation (3.4.9)
Update Sass documentation (3.3.9)
Update Express.js documentation (4.4.5)
Update Redis documentation (2.8.12)
Update Less documentation (1.7.3)
Update Git documentation (2.0.1)
Update Go documentation (1.3.0)
Update Laravel documentation (4.2.0)
Add Chai documentation
Add Sinon documentation