[READY] Upgrade chart.js

This PR is mainly to see if we can switch to chartJS's 1.0.1 beta (source: https://github.com/nnnick/Chart.js/releases/tag/v1.0.1-beta.3)

I have manually included the library: 7793067f191c835d4a6811e36becb956b2c11c62

Everything seems to work fine, maybe someone can confirm?