added accUpdate to nn.LookupTable
MixtureTable:updateOutput
MixtureTable:updateGradInput
MixtureTable unit tests
MixtureTable:updateOutput (expertInput is a Tensor)
MixtureTable:updateOutput (expertGradInput is a Tensor)
MixtureTable unit tests  (expertInput is a Tensor)
MixtureTable doc
MixtureTable example2 + bug fix
MixtureTable works for 3D tensors (unit tested)
MixtureTable works with 1D inputs (unit tested)
MixtureTable doc++
MixtureTable type-cast unit tests
preparing interface for CUDA
nn.View is mislabeled in the doc.
Merge pull request #36 from jonathantompson/doc_fix

nn.View is mislabeled in the doc.
initial commit for recursive ConcatTable
ConcatTable recursive table unit tested
ConcatTable example2 doc++
2D gater 1D experts unit test