Timing of 'chosen:showing_dropdown' fixed

Currently the event is triggered before dropdown LI's
are created. This commit corrects it by moving the
trigger event at end of method. A JSFIDDLE was created
to demonstrate the issue.

http://jsfiddle.net/lagrz/3A5jq/

By moving the event it enables developers to add
whatever additional code or styling to the dropdown
menu options such as images.
Fire the `chosen:showing_dropdown` event only after results
are totally built.

Further information about this fix is described in:
3246598cbb93b66026828ab85754c65378f43ea9
Added license to non-minified css file
Use concat to add license banner to css file.
fix tiny typo in contributing doc
Merge pull request #1602 from daveworth/fix_typo_in_contributing_doc

fix tiny typo in contributing doc
Merge pull request #1494 from harvesthq/add_license_to_css_file

Added license to non-minified css file
add support for cut/paste events

A short delay (currently 50ms) is required after the paste event for the
pasted text to enter the textbox.  Then we can trigger a `keyup` event as if
that copy had just been typed into the box manually.
Add "chosen:close" triggerable event
Docs!
Whitespace!
Merge pull request #1663 from harvesthq/chosen_close_event

"chosen:close" triggerable event
Merge remote-tracking branch 'upstream/master' into add-shift-selection
Support jQuery < 1.6 by not using $.fn.is().

Adapted from rooby's pull request for issue #1555.
Merge pull request #1702 from opensourcery/master

Remove use of `$.fn.is()` in favor of more widely supported methods.
trigger "chosen:no_results" event, with second arguments added
make sprite vars default to be able to preset outside of chosen
Merge pull request #1736 from benib/sprite-vars-default

make sprite vars default to be able to preset outside of chosen
Add note that Chosen is disabled on mobile
Remove linear-gradient from single chosen input background