Add PyTorch implementation for P4 and P4M GConv#5

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jornpeters wants to merge 3 commits intotscohen:masterfrom jornpeters:pytorch_p4_p4m_gconv

+338

Commits on Jun 11, 2017

Add PyTorch implementation for P4 and P4M GConv
jornpeters
committed

Commits on Jun 12, 2017

Initialize bias with zeros instead of ones
jornpeters
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Commits on Jun 13, 2017

Add super class and self reference to super call for py27 support
jornpeters
committed