Added Bootstrap 3.0 files (js + css + fonts); updates: search field to match 3.0 markup in JS, LESS template, HTML examples.

Updated license: dual licensed with Apache 2 and BSD 3-Clause. Fixed issues with doubling "select all" options by using rebuild. Added buttonTitle option, see #138.

Moved CSS declarations into separate LESS file. Filter will now be
rebuild, too.

Fixed #82. Added beta js and demo html. The "new" multiselect will be more structured but hopefully offering the same possibilities with better performance.

Updated readme and demonstration files.

The filtering option will now hide or show the filtered options instead
of destryoing/rubuilding them. So selected options will not be
destroyed. Updated the demo an knockout examples. Added "fork me"
slogan.

See #76, #75. Updated demo and knockout examples. Multiselect iwll adopt
the disabled state of the select.