Remove uneeded deps

[iocanel]

This pull request does the following:

• Removes dependencies that are not really needed:

  • slf4j-simple: A library like this should not drag in the classpath a logging impl.
  • fingbugs annotations: It's not really used

• Define as optional dependencies that are compile time only (e.g. annotation processor).

• Tune release script so that samples use release version, but main branch switch back to SNAPSHOT right after release.