Add newly designed retina display icons#182

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afh wants to merge 4 commits intorowanj:masterfrom afh:pull/icons

+143-34

Commits on Apr 29, 2009

diffHighlighter: Added toggle of display for diffs
afh
committed

Commits on Jan 5, 2010

Merge branch 'master' of git://github.com/pieter/gitx
afh
committed

Commits on May 31, 2013

Merge remote-tracking branch 'rowanj/master'
afh
committed

Commits on Jun 1, 2013

Add new icons to support retina display
afh
committed