Updated less, respond.js, modernizr, html5boilerplate

Mentioned in #414 that the html5boilerplate was pretty old

Updated is
* jquery (from 1.7.2 to 1.11.0)
* modernizr (from 2.5.3 to 2.7.1)
* respond.js (from 1.1.0 to 1.4.2)
* lesscss (from 1.3.0 to 1.7.0)

Though not much changes in h5bp, just the google analytics code, and the links to the new versions