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 **

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