Merge pull request #17 from Devristo/master

KnockoutJS data binding support.
Added rebuild method.

Added a rebuild method suggested in Issue #19. Additionally added
documentation for Knockout JS - see Issue #17.
adding disabled option support
Update js/bootstrap-multiselect.js

Remove trailing comma to support IE 8 and below versions.
Merge pull request #20 from joaojose/master

Adding disabled option support.
Merge pull request #21 from stephanoff/patch-1

Update js/bootstrap-multiselect.js.
Added prettify and disabled options example.

Added google code prettify and an example for disabled state.
KnockoutJS multiple binding handler now rebuilds dropdown instead of refreshing it. This is needed for data binding