#143. #183, #89, #78. But not perfect. Select all option needs to be updated depending on the filter.

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.

Added the selectAllValue option to change the value by which the select
all option is identified. Cosmetics.

Fixed an issue concerning the refresh method and the unfocussing of the
filter search input after filtering the options.

Updated documentation: includeSelectAll, selectAllText, selectedClass,
enabledFiltering and filterPlaceholder options. Updated the README.
moved the filter initialization to the buildDropdown method. The rebuild
method has to remove the search field, too, otherwise it will be
duplicated.

Typo corrected.

Fixed issue 43 with IE 9. Added documentation for pull request 42 fixing
issues #39, #40, #41. Thanks to ses4j!