Update coffee/chosen.jquery.coffee

Address jQuery 1.9 removing $.browser
Update coffee/chosen.jquery.coffee
Following stof's advice
Merge pull request #950 from ShaneShipston/master

jQuery 1.9 - $.browser removed
Rebuild the compiled version
Added the jQuery manifest file
Update the version number to 0.9.12

- Non-retina fixes #925, #955
- jQuery 1.9 support (removed browser) #950
- jQuery manifest
Add some debugging info to cakefile.
Added explicit empty returns to jQuery event handlers

This resolves issues with jQuery preventing event bubbling due to
Coffeescript's implicitly generated return value of the last expression.
Merge pull request #1071 from BrandonLWhite/master

This resolves Issue #1055
Merge branch 'master' of git://github.com/harvesthq/chosen into option_adding