Serialize and deserialize module meta info
Serialize and deserialize module meta info

The meta info is well used by extract text plugin to determine modules
to extract. To support extract text we don't need to do anything
special beyond serializing that field we hadn't up to this point.
Fortunately webpack requires meta to be stringifiable already so we
don't need to worry about circular data popping up in there.

mzgoddard/hard-source-webpack-plugin