Improve JavaScript scraper
Silent nokorigi/libxml2 warnings
Improve DOM scraper
Update Laravel documentation (4.2.11)
Update Chai documentation (1.10.0)
Update Sinon.js documentation (1.12.1)
Update Python documentation (3.4.2)

Fixes #137.
Add Python 2 documentation
Improve C and C++ scrapers

Fixes #138.