fix for issue #23
Implemented issue #11: First day of week now depends on Locale
Updated testcase for issue #11
Implementation for issue #4: Constraints to limit date selection
Testcase for issue #4
Fix for issue #26: First week cut off in saudi arabia locale
Constraint receives model, non-selectable cells are greyed, fixed issue with not selected eval of constraint
Merge pull request #27 from bratkartoffel/issue4

Fix for issue #4
Merge pull request #28 from JDatePicker/fixes_on_pull_request_27

Issues with merge request fixed
Merge pull request #25 from bratkartoffel/issue11

Fix for issue #11
Merge pull request #24 from bratkartoffel/issue23

Fix for issue #23