Feature request / bug: Struct[] return type support

[coinop-logan]

Seeing that one of the test or example files had pragma experimental ABIEncoderV2, I wrote this "Scripts" contract which returns a dynamic-sized array of the StoredMessageData from the SmokeSignal contract. The Scripts contract results in this ABI.

Unfortunately, elm-ethereum-generator fails to build an Elm binding from this, with the message Error in $[0].outputs[0].type: unrecognized JSON ABI Solidity type: "tuple[]"

I'm not sure if this is a bug report or a feature request, considering this is part of that "experimental encoding" mentioned above, and it's not clear whether that's supposed to be supported.