abi-to-sol v0.7.0

This release adds a new feature to allow abi-to-sol to generate embeddable output -- that is to say, output that can be appended to an existing Solidity file; no pragma, no license identifier, etc. You can specify this with the command-line option --embedded (or -E); when used as a library, it's specified by the option { mode: "embedded" }, as opposed to the default { mode: "normal" }.