add labels to versioning

[dittodhole]

see http://semver.org/

Additional labels for pre-release and build metadata are available as extensions to the MAJOR.MINOR.PATCH format.

yadda yadda yadda ... System.Version does not support this shit, maybe with Version.MinorRevision and Version.MajorRevision, which only gives you ints ... arrr

Could be achieved with System.Reflection.AssemblyInformationalVersion.

read up: http://stackoverflow.com/questions/64602/what-are-differences-between-assemblyversion-assemblyfileversion-and-assemblyin

cheers and 🍻