Datepicker: Use Globalize 1.0.0

- Update $.date, and datepicker tests;
- Update globalize; (previously, the link has been committed)
- Update demos;
- Change Week of Year of $.date days(). Drop iso8601Week and instead use CLDR's
  Week of Year ("w" pattern) generated using Globalize.format;
Datepicker: Test for up and down arrow keys
Datepicker: Tests for Page Up and Page Down keys
Datepicker: Tests for moving years with Page Up and Page Down