Change dataprovider tags variable into an array.

Created an inheritClasses option (default: false) that pulls classes (documentation still to be done).

Update bootstrap-multiselect.js, To solve the search issue when using optgroup

** Fixed regression on setOptions (#444) **

** Fix for #427 **

** fix for #430 **

** Fix for #429 and #434 **

Improved knockout binding.

Shift + Click range selection improvements. Fixes #431.

** Moved the default caret under the drop-down button text to accommodate with fixed-width restrictions **

Change dataprovider tags variable into an array instead of jquery object to keep order of dataprovider array. Got rid of .add() as jquery states:

http://api.jquery.com/add/
"Do not assume that this method appends the elements to the existing collection in the order they are passed to the .add() method"

Improves the initialization of the multiselect by waiting for other select related bindings to finish first.
Moved the subscription to other binder events to init so they aren't re-executed all the time.
Added support for value binding.
Added support for observable configuration properties.
Observable subscription rate-limited (by @IDisposable).
Simplified how selection changes are processed (simpler code, not sure about performance).

-> Added setAllSelectedText function to set the text displayed when all options are selected dynamically at runtime
-> Updated doc

Merge branch 'fix_#431' of https://github.com/Tyf0x/bootstrap-multiselect into shift-select-improvement

-> Fixed a failure on test for #405 due to the code changes

-> Moved the downward chevron to the button template.
-> The button text is now inserted into any container using the class "multiselect-selected-text" inside the button tag.

-> 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.

-> Added an overflow: hidden and text-overflow:ellipsis to the button CSS if a buttonWidth is specified
-> Updated doc

-> 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