Updated Bootstrap select to 1.6.3 with language support

Updated Bootstap Select to the last release.
This release solves some issues, ha described in this post https://groups.google.com/d/msg/gwtbootstrap3/38UhhOcCbOQ/F_k4YiZA_FIJ.

I also added internationalization support for the languages currently supported.

Finally i added the support for the options data-max-option and data-mobile. The first one set the max selectable Options. The last one tell the component to use the native mobile select.

I'm currently testing this changes from 3 days in an application for a client of mine.