v4: change date() value before triggering 'change.dp' event
v4: option widgetParent
v4: prevent setting an invalid date
Merge pull request #655 from Koloto/v4/changeEvent

v4: change date() value before triggering 'change.dp' event
Merge pull request #656 from Koloto/v4/widgetParent

v4: option widgetParent
Merge pull request #657 from Koloto/v4/invalidDate

v4: prevent setting an invalid date