Converted master.js to jQuery

All features are preserved, though some may call for optimisation.

ready.js is now no longer needed.

Also, feature totals are now coloured from red to green denoting how
many are implemented.
Fixed sorting and column hovering.

Also added a visual garnish: platform header cells now have a 'bar graph' gradient background corresponding to their feature total.
Used .css() instead of making a <style> element.
Merge pull request #271 from webbedspace/jquery

Converted master.js to jQuery