Compatibility with Jenkins 1.596 and better support for Firefox

As the Christmas break is now finished it's time to get a new release out of the door!

This one introduces the following changes:

• Build Monitor is no longer affected by breaking UI changes introduced in Jenkins core 1.596:
  • the gear icon should not be cropped - thanks @mattjmorrison
  • Jenkins header and footer should stay hidden (#118)
• Job names are centered vertically and the progress bar correctly pulsates in Firefox (#95) - thanks @kriserickson
• Build Monitor supports LESS stylesheets, so adding any new UI changes should be simpler (ccab70b)

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Have feedback? Let me know on twitter: @JanMolak