Added ability to implement delegate methods that notifies when scroll ha...

[armandvanderwalt]

...s ended and the state of the cell, this allows for implementations where you would want to execute a command when scrolling ends

Usage:

-(void) swipeableTableViewCell:(SWTableViewCell *)cell didSwipeToState:(SWCellState)state
{
if(state == kCellStateLeft)
{
NSLog(@"Swiped right");
}
if(state == kCellStateRight)
{
NSLog(@"Swiped left");
}

if(state == kCellStateCenter)
{
    NSLog(@"Closed");
}

}