Update to 1.1.3 from advanced bootstrap-datepicker.js version

Here's what changed:

- Now uses the more advanced and up to date version from http://eternicode.github.io/bootstrap-datepicker/ (1.1.3 release).
- Added minified JS version.
- Added i18n JS files.

I also added a local buildout so that one can test the package with py.test and create the minified versions using cssmin and jsmin since they are not provided by the JS library.

To do so, simply run:

    ./bin/fanstatic-compile -v js.bootstrapdatepicker