evolve: revision graph

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evolve: use `merge.graft` instead of `rebasenode` stable
Sat, 13 Dec 2014 17:47:09 -0800, by Pierre-Yves David
readme: add a reference to the bugtracker in the contribute section stable
Mon, 08 Dec 2014 12:45:32 -0800, by Pierre-Yves David
merge with stable
Sun, 30 Nov 2014 00:11:06 -0800, by Pierre-Yves David

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