Update JSHint settings

Removed `false` ones (not necessary), and added `unused` (so deleted all the unused vars) and `nonew`

Quite keen on adding `quotmark: "single"`; thoughts?

![1371747602_popocatpetl_volcano_explosion_2013](https://f.cloud.github.com/assets/74132/2420852/0a0bea00-ab79-11e3-955f-4f4a2e254af3.gif)