Wednesday, February 6th, 2013, at 9:40 A.M:

Create a temporary function for sending invocation from the ViewController instance
Merge remote-tracking branch 'origin'
Wednesday, February 6th, 2013, at 12:52 P.M:

1. Add SequenceDiagramDataSource to the project (again!!!)
Merge remote-tracking branch 'origin'
added method to draw arrows, not in use yet