Made Ethernet library non Blocking#1240

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DavyLandman wants to merge 2 commits intoarduino:masterfrom

DavyLandman:master

Commits on Jan 7, 2013

Fixed the formatting mess (now all tabs)
DavyLandman
committed
Imported work from DavyLandman/NBEthernet adding a non blocking variant of most Ethernet functions.
DavyLandman
committed