Feature request: compatibility with Truffle-generated json files

[coinop-logan]

In a truffle development environment, it would be really nice to be able to use elm-ethereum-generator directly on Truffle's output files. In case it's helpful, I'm including both the Python script I run to extract the abi before running elm-ethereum-generator, and such a Truffle build output file that I would run it on.
truffle-stuff.zip