[DOCS] Add install docs, fix Jenkins (#57)

nnvm/Jenkinsfile

nnvm/Makefile

nnvm/NEWS.md

nnvm/README.md

nnvm/docs/how_to/contribute.md

nnvm/docs/how_to/deploy.md

nnvm/docs/how_to/install.md

nnvm/docs/index.rst

nnvm/python/nnvm/compiler/param_dict.py

nnvm/python/nnvm/libinfo.py

nnvm/src/compiler/graph_fuse.cc

nnvm/src/top/tensor/transform.cc

nnvm/tests/ci_build/Dockerfile.gpu

nnvm/tutorials/from_mxnet.py

nnvm/tutorials/from_onnx.py