Fix for jQuery 1.9
Merge pull request #727 from Schlogen/master

jQuery 1.9 Fixes
Update select2.js

missing parenthesis at line :1448 & :1845
Merge pull request #735 from vlycser/patch-1

Update select2.js
fix parenthesis mismatches
allow ajax.data to be undefined. fixes #732
Avoid error when label has no matching element

$('#no_such_element').data("select2") returns null rather than
undefined (jQuery 1.9.0).
Merge pull request #736 from tamias/label_no_element

Avoid error when label has no matching element
Use tags correctly when set as a function.
Merge pull request #738 from arnar/master

Wrap tags correctly when passed as a function.
Update select2.js

Fixed issues with select2 and disabled options, most of it having to do with incorrectly determining the index of an option when disabled options were being displayed.
Update select2.css

Made disabled results show up disabled, and added a class "selected" for elements that have already been selected (by default, these elements are hidden).
Update select2.js
Update select2.css
fixes #742
optimize string comparisons. fixes #743
Merge pull request #747 from Kollibri/master

Fix issue with disabled options (Issue #733)