Added the selectAllValue option to change the value by which the select
all option is identified. Cosmetics.

Fixed an issue concerning the refresh method and the unfocussing of the
filter search input after filtering the options.

Updated documentation: includeSelectAll, selectAllText, selectedClass,
enabledFiltering and filterPlaceholder options. Updated the README.
moved the filter initialization to the buildDropdown method. The rebuild
method has to remove the search field, too, otherwise it will be
duplicated.

added a reference to the constructor so I can override the default options when initializing multiselect with data-role attribute

we dont need to call $('#element').multiselect() before ko anymore

Added selectAll option and demos. Further cosmetics, comments etc. .

Removed browser sniffing for IE and use :selected pseudoselector everywhere

* Use prop("property", false), rather than removeProp("property")
* Use prop("selected", true), rather than prop("selected", "selected")

Fixed issue 43 with IE 9. Added documentation for pull request 42 fixing
issues #39, #40, #41. Thanks to ses4j!

Fix encoding issues by avoiding val() in selectors, hybrid optgroups and options on the top level, and supports label attributes on <option> tags.

Fixes #39, fixes #40, fixes #41.

Updated the rebuild method to update the button text. Using
option[selected] instead of option:selected. Fixed both #37 and #38. See
http://jsfiddle.net/XrGzY/8/ and
https://gist.github.com/jameslnewell/5288436.

Removed width:100% style from <label> to keep outline inside menu
Reapplied keyboard support

The buttonText function will get the select as second parameter.

Added example for option group support and removed option "showGroups".