DatePicker date moves backwards when clicking the calendar icon with custom format

[Cpousson]

To reproduce:

• use a custom format:
  $('#datepicker').datepicker({ format: 'mmmm yyyy' });

• Choose a date

• Click calendar icon one or many times

The date will walk backwards a month with each click of the calendar.

[atatanasov]

We fixed that in the new development build. You can find the new development build in the dist folder at github.