SingleDatePicker, minDate / maxDate and Open top improvements

SingleDatePicker improvements :
* Add showApplyButton option
* Add showCancelButton option
* Ranges option available
* Template modified (for apply/button to show on bottom if no range)
* Examples added

* Enable minDate or maxDate day in calendar when minDate time or maxDate time is defined

* Open daterangepicker on top if no place to show it on bottom