(Dynamically) Retrieve Caffe Layers and their arguments

[TimZaman]

The layers and their args should preferably be formatted to .json.

Listing Caffe Layers

• Through python and https://github.com/BVLC/caffe/pull/2930 (from https://github.com/caffe2/caffe2/issues/42#issuecomment-243251598); Example .json output: https://github.com/TimZaman/dagstudio/blob/master/tests/caffe-all-layers.json

Listing Caffe args

• By protobuf introspection, f.e. https://developers.google.com/protocol-buffers/docs/reference/python/google.protobuf.descriptor-module from (https://github.com/caffe2/caffe2/issues/42#issuecomment-245172384)
• By parsing the .proto with https://github.com/nlf/node-proto2json/pull/1 ; Example .json output: https://github.com/TimZaman/dagstudio/blob/master/tests/caffe.json