new mac osx icon
new mac osx icon

check why/preview: http://dl.dropbox.com/u/7383846/new_bitcoin_qt_mac_icon.png

- according to official bitcoin logo
- no chopped shadow
- retina-screen support

Signed-off-by: Jonas Schnelli <d52d30fd74b5a4c9059a4ca104ac43d29d9077a0@include7.ch>

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