addTimeBlockClickHandler should end date.

[GoogleCodeExporter]

Description of the new feature:
Currently this event only gives the start date as compared to both start and 
end date. 

Passing end date is desirable. 

Use Case:
This would be useful in auto populating the end date so that user doesnt have 
to enter it. 

Assumptions:
1.
2.
3.

Exceptions:
1.
2.
3.

Code / psuedo-code:

class TimeBlockClickedTarget {
  Date startDate;
  Date endDate;
}

Original issue reported on code.google.com by pulastya...@gmail.com on 24 Nov 2010 at 7:54