KnockoutJS data binding support.

Added KnockoutJS support by using a custom 'multiselect' binding handler.

Example:

1. Define select input
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<select class="multiSelect" data-bind="multiselect: true,options: Options, selectedOptions: SelectedOptions, optionsValue: $data" multiple="multiple"></select>

1. Initialize Bootstrap-multiselect
-------------------------------------
$(".multiSelect").multiselect();

3 .Apply view model

Added support for adding a maximum height property to the dropdown list.
Renamed some options.

Added support for adding a maximum height property to the dropdown list.
Renamed some options.

Code to add/remove 'active' class on refresh.

Fix htag movement on click event (Firefox).

Updated the code to JQuery 1.9 keeping it compatible with 1.8. In
addition fixed issue #10 and #11.

Updated README and index.

Updated documentation concerning the new 'onchange' option and added a
refresh method.

2 lines of code added to add support for change event.

Bootstrap multiselect and tabs will now work on the same page.

Added the possibility to destroy/unbind the plugin. Adjusted link and
label style for the dropdown. Minor changes.

Added Roadmap / Todo. Current solution for multiple selects is not
usable for mobile devices with touchscreen.

The dropdown butotn can now be customized by using classes. Removed the
'none' option and renamed the 'selected' option to 'text'.

Added license to README.