Memory usage.

[sdrpa]

First of all, thank you for the great component, I have small tip about improving memory usage for the infinite grid.

I noticed huge memory usage while profiling an app. using the infinite grid view.
When you scroll the infinite grid, method

tileGridsFromMinX:toMaxX:

which adds/removes views from one side using either

 [lastGrid removeFromSuperview] or [firstGrid removeFromSuperview] 

in ARC env. [lastGrid removeFromSuperview] doesn't release the view.

Similar problem I encountered with CorePlot: https://groups.google.com/forum/#!searchin/coreplot-discuss/memory/coreplot-discuss/nWui9VjnMtQ/er2FO3o9syYJ

If you do:

lastGrid = [self.visibleGrids lastObject];
while (lastGrid.frame.origin.x > maximumVisibleX) {
   [lastGrid removeFromSuperview];
   [self.visibleGrids removeLastObject];
   [self.gridReusableQueue addObject:lastGrid];

   lastGrid = nil;

   lastGrid = [self.visibleGrids lastObject];
}

Memory usage is much more efficient. I've tested it in instruments, without lastGrid = nil I can easily reach 60Mb after 30 seconds of scrolling, with the line it increases but very slowly stays around 15Mb.