Build binaries on CI and add them to GitHub releases #14
Description
When we tag a new release, it would be nice if a CI built and uploaded the binaries to GitHub releases automatically.
We can make Travis CI do that but I would also like to compute sha256 sum and sign the hashes in an independent environment, separate from the primary CI.
Also, if we do that, we'll probably want to embed the version of the tools in the binaries so that I can reporter --version and see which version of reporter I'm using.
/cc @samturci