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

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
authored

Commits on Jun 13, 2017

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