Greater browser support

Basically, get ads to work in IE8. Bulk of the work was moving away from using the cool native array functions, which don't exist, to lodash

Also, now using proper qwery, not the mobile variant

However, still doesn't work due to an [issue in reqwest](https://github.com/ded/reqwest/pull/152)
Moved out of the above 'isModern' function - the `js-on` class should purely be about javascript. Can add an `is-modern` class if need be