v2.0.0-pre1
feature: progress bar no longer shows before focusing on progression element, closes #10
feature: each progression popup (formerly 'tooltip') now has a unique id
  and can be styled with css, closes #15
feature: the ``data-helper` attribute is eliminated, the 'help' text goes
  in `data-progression`, closes #6 and aarondo/progression.js#6
feature: input validation is now performed at a basic level, closes #20
js: source is now in CoffeeScript
css: .percentagebar is now .progressbar, closes #7
js: options: showHelper is now showFraction, but disabled, closes #9
js/css: now using css class .progression instead of
  {`.tooltip`,`.syco_tooltip`}, closes #11
css: all classes have been renamed, relying on CSS1 nesting, closes #11
css: options.animate and css .animate now use the same nomenclature, closes #16
js: progress bar is now animated by default, optimization! closes #13
js: options: all options have been renamed shorter, closes #14