[author] Updated less.js to 1.7.0

Source: https://github.com/less/less.js/blob/v1.7.0/dist/less-1.7.0.js
and https://github.com/less/less.js/blob/v1.7.0/dist/less-1.7.0.min.js

We're going to switch to auto updates in 2.0.0

Thanks