-> Now able to select/deselect ranges
-> The range is based on the previously active checkbox. (i.e: the user clicks a checkbox no 1 then checkbox no 5. The interval will be [1,5].)
-> The range new state (selected or deselected) depends on the last option clicked new value. Example: If the checkbox is Shift-clicked and becomes selected, the whole range will be too.
-> Improved the range select speed tremendously by only notifying the select for the "change" event once the whole range finished changing and manually doing the selection or deselection.

-> See https://bugzilla.mozilla.org/show_bug.cgi?id=559506
-> Removed the javascript:void(0) href for anchor elements in the multiselect dropdown
-> Added a tabindex = 0 to keep the anchors focus-able
-> Added code to remove any text selection when using shift+click
-> Handles the checkbox selection manually when done using shift+click on its label

Fixes #405

Updated documentation. In short: #380, #365, #381, #377, #385, #384, #388, #302, #305, #391, #374, #397, #400, #375, #383, #301, #382, #386, #387, #404.

#375, #383: Avoid changing unrelated parent elements.

Correct filtering with optgroups.

#374. Added optional clear button for filter feature.

#385, #384: titles for options, supporting dataprovider; dataprovider with preselected options.

Allow options to be defined by data attributes.

#305, #302. Added enableClickableOptGroups option.

Only deploy the necessary files with Bower.

#377. Allow enter in filter.

#365. Additional option for selectAll.

Factorise some code too

Add ability to handle the "caption" property from the dataprovider() to display a title on hover of each option label

Update doc

Use .closest() instead of .parents() because the latter will also reach parent elements of the plugin container

In other words, if the multiselect plugin is used inside an LI.container tag, it will eventually modify it which is not intended