Add configurable "width" option to Chosen selects.  Allow full support for px and % based widths.
- Verified working with Chrome, Safari, Opera, FireFox8 on OSX for both jQuery and Prototype flavors.
- Remove programatic search field sizing, and replace with a CSS styled approach using absolute left/right positioning.
Add configurable "width" option to Chosen selects.  Updated output files.
Missed the "px" on f_width for jQuery
Add fixup_width to AbstractChosen to return a 'px' formatted width string if no existing format is specified.
Cleanup some leftover width calculations for the drop down.
set style width in jQuery chosen instead of 'width' directly to be consistent across implementations.
Cleanup CSS to remove redundant style information.
Update example pages with blurbs about using the 'width' option.
Reorder box-sizing CSS styles based on feedback from Christophe Coevoet.
- Add comment string with a short description of what's happening, and a link to a site that explains box-sizing.
Don't stop mouse event propagation if results are showing. Otherwise text in the search input cannot be selected with the mouse.
One more fix regarding issue #18. Still had problems sometimes with jQuery UI modal dialogs with z-index: 999; there.
Fix an issue where specifying the 'disable_search_threshold' option on single selects with custom widths did not work properly.
- Properly hide the absolutely positioned search box when 'disable_search_threshold' is in effect.
Update examples of using options on jQuery and Prototype pages.
- Make it simple to include multiple option configurations on example pages.
- Add disable_search_threshold example.
- Add No results text option example.
- Update custom width support example.
Fix tabindex on example page elements.
`chzn-default` class for styling placeholder text
Smushed sprite image from 1560 to 559 bytes
Add: Join extra-parameters to the change event triggered when a result
is deselected (result_deselect method). For now, just the deselected
item's value is added.

In jQuery, these parameters are accessible as the second "event handler"
argument (the first one is the event).
Add: also added extra-parameters to the change event when an item is
selected.
Merge pull request #486 from binarycode/master

Smushed sprite image from 1560 to 559 bytes
Merge branch 'feature/placeholder-styling' of https://github.com/parshap/chosen into parshap-feature/placeholder-styling
Merge branch 'parshap-feature/placeholder-styling' into placeholder-styling