Whipped Selectron better into shape, improved docs

HTML and CSS:
- Added cssAnimationOnly styles ("selectransitioner" class),
- Made all Selectron elements box-sizing: border-box and width of list
from fixed px value to 100%,
- Changed .selectron from <span> to <div> (suck it, IE7
display:inline-block bug),
- Changed .selectron__selected__inner from <span> to <div>,
- Moved inline-block vertical alignment fix from .selectron to
.selectron__selected,
- fixed IE8 vertical alignment by changing vertical-align to Baseline,
- fixed visual disconnect between faceplate and expanded list
Core:
* Added mouse button detection so list only triggers off left mouse
button
* Activate selectrons based on HTML5 attribute, rather than just getting
options
* Added new options:
- # inheritPosition - apply display and position CSS from original
select (false, formerly true without the option),
- # classes - classes to apply to .selectron element
- # style - inline style to apply to .selectron
- # listStyle - inline style to apply to .selectron__list
- # cssAnimationOnly - don't animate lists with jQuery (false),
* Reworked buildSelectron and updating/applying options:
- # fixed many options not updating,
- # only create clone when autoWidth is set,
- # various further optimizations and cleanup,
- # removed some IE7 considerations,
* Show/Hide List cleanup
- # optimized showList not to perform superfluous element lookups,
leverage jQuery.data(),
- # tighted up state class application/removal,
- # removed some IE7 considerations,
- # added support for CSS-only animations,
- # check function options before running instead of blindly running
empties,
- Changed default for several function options from empty function to
null to reduce needless function calls,
- Changed autoWidth default from false to true,
- Changed "data-sel-options" to "data-selectron",
- Moved initial "display: none" of .selectron__list from JS to CSS,
- Removed stopEvent, all supported browsers can use e.preventDefault()
now,
Demo Page:
- Added more examples,
- Moved scripts to bottom
- Made debug info optional, load in with $.getScript(),
- Removed some outdated info (more to do),
- Separated Requirements from Features