Update DateTimePicker.js

Fixed bug when parsing the following datetime format: "MM-dd-yyyy HH:mm:ss". -1 was being done to the day instead of the month.
Update DateTimePicker.js

When setting the value the change event is now raised on the element.  This allows frameworks like Knockout.js to be notified that the value changed so they can bind.
Merge pull request #2 from TrueEddie/patch-1

Update DateTimePicker.js