Concrete Mix Alpha

For the past few days I have been working hard on getting Mix into a state where it can be released. It's slow going; I have been cutting out everything that isn't necessary for a "preview" (like integration with .NET, support for some level of nominal typing, and a few other things, all of which I intend to discuss at some point). So sorry about the dry spell, it will rain (if only lightly) soon enough.