SwiftProtobuf 1.0.0 Release

This first official stable release of SwiftProtobuf is the result of a collaboration between Apple and Google engineers to produce a world-class protobuf implementation for use by Swift developers.

P.S. A heartfelt "Thanks!" to all the folks who helped get us to this point by submitting code, asking questions, and simply using the pre-release versions. We could not have done it without you!