WIP: add nnvm binding

[iblislin]

No description provided.

[codecov-io]

Codecov Report

Merging #410 into master will decrease coverage by 1.24%.
The diff coverage is 2.56%.

@@            Coverage Diff            @@
##           master    #410      +/-   ##
=========================================
- Coverage   71.35%   70.1%   -1.25%     
=========================================
  Files          27      28       +1     
  Lines        2133    2171      +38     
=========================================
  Hits         1522    1522              
- Misses        611     649      +38

Impacted Files	Coverage Δ
src/base.jl	33.7% <ø> (ø)	⬆️
src/nnvm/graph.jl	0% <0%> (ø)
src/symbolic-node.jl	73.44% <100%> (ø)	⬆️

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