In this commit, we add the new release script that will be used to build
all release binaries going forward. We also remove the existing
Conformal key as it's no longer in use, updating the README to reflect
the new release build/verification process.
This updates the README to remove the mailing lists which no longer
exist and to link the GPG public key used to sign the release tags
directly from the repository instead of the no longer active website.
This commit adds version information to btcctl. The plan is to keep
it in lock step with the btcd version. It also updates the release script
so the version file is updated automatically with the btcd one.
