Add GMGridViewDidScroll, Geometry and pageForContentOffset#22

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rantav wants to merge 14 commits intogmoledina:masterfrom rantav:master

+31-16

Commits on Dec 7, 2011

Add support for setting showsVerticalScrollIndicator and showsHorizontalScrollIndicator
rantav
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Commits on Dec 23, 2011

Add build directory to .gitignore
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Commits on Dec 24, 2011

Commits on Jan 13, 2012

Use algebra to calculate _numberOfItemsPerColumn, instead of a while loop
rantav
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Compute _numberOfItemsPerRow with algebra instead of a while loop.
rantav
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