[Example] integrate int8 *.pb model into polyfill

[lisa0314]

[cuiyanx]

@lisa0314
The int8*.pbtxt readed by protobuffer tool is too slow, maybe read int8*.pb better.

[cuiyanx]

@lisa0314 @huningxin
I finish analyzing caffe2 int8 model on my local PC, and as Lisa ask, I create transfer tool.
https://github.com/cuiyanx/caffe2-protobuf

[cuiyanx]

@lisa0314 @huningxin
I finish the importer of caffe2 int8 model on my local PC and ready to integrate this importer.
I update the code to caffe2-protobuf.
To run: node ./src/main-test.js