Deletion, ARC, Sections, Possibility to add buttons on cell

I have added the possibility to delete the cells from the grid view,
modified the UIGridView classes to work on ARC, Added the possibility
to split the gridView in sections and added the possibility to include
buttons (UIIndexedButton) or other controls on the UIGridViewCell
Added DSStore files
Fixed Bugs
DElete button name lowercase, Support different orientations
Enhance the speed and code style

Manage the code structure of the demo project.
Leave UIGridView alone.
Enhance the speed by reducing the use of delegate.