Tidied-Up CSS in Solution Explorer

Removed unused site.css. Associated .css files with parent .less files.
Implemented Audio.JS

For a consistent look over all major browsers, audio.js's UI widget is
now displayed instead of each browsers' native HTML <audio> controls on
the tours editing panel. Have not customized colors, but this should be
easy to do if desired. e.g.
http://kolber.github.io/audiojs/demos/test2.html
Implemented autoNumeric

autoNumeric applied  to tour stop lapse time input, to ensure
client-side only permits integer entry in a suitable range. (Validation
also on server-side but this is nicer user experience.)
Merge branch 'jquery-plugins' of git://github.com/NeilCresswell/ChronoZoom into NeilCresswell-jquery-plugins
Merge branch 'NeilCresswell-jquery-plugins'