Fixes

Fix Mac build issues. Fix flipped Mac scrolling issue. Fix issue with tableview visible rows.
Oh yeah, that property used to flip the position.

> On Dec 17, 2014, at 9:49 PM, Scott Lembcke <notifications@github.com> wrote:
> 
> In cocos2d-ui/CCScrollView.m <https://github.com/andykorth/cocos2d-iphone/pull/1#discussion-diff-22022422>:
> 
> > @@ -1171,9 +1169,12 @@ - (void)scrollWheel:(NSEvent *)theEvent
> >      {
> >          // Update scroll position
> >          CGPoint scrollPos = self.scrollPosition;
> > -        scrollPos = ccpAdd(delta, scrollPos);
> > +        scrollPos.x += delta.x;
> > +        scrollPos.y = (_flipYCoordinates ? -scrollPos.y : scrollPos.y) + delta.y;
> The scrollPosition property is public though. It seems weird to set a negative scroll position.
> 
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> Reply to this email directly or view it on GitHub <https://github.com/andykorth/cocos2d-iphone/pull/1/files#r22022422>.
>