Porcelain to generate, compile, sign

[ebuchman]

Currently, generating, compiling, and signing are three different steps. While this is great for low level plumbing, ultimately this should be possible by a single command.

This will be critical to demonstrate the value of the tool in more rapidly firing off contracts.

[shonfeder]

I think this is a duplicate of #8, specifically the execute command proposed there.

[ebuchman]

Yep!