Is there api for dump nnvm params to file?

[nkyle04]

I have run a mxnet model at nnvm.
As I want to deploy it with tvm, but i can't find any api to dump params to bytearray, which was need ed in "load_params" funtion.
As described at http://nnvm.tvmlang.org/how_to/deploy.html

[tqchen]

http://nnvm.tvmlang.org/api/python/compiler.html#nnvm.compiler.load_param_dict

[tqchen]

Since this might be a common need, do you mind open a PR and add this information to the how to deploy document?