Adding Banno/jsonz to community build.

We also have a couple of sbt plugins that we can offer up as testable.

* https://github.com/Banno/sbt-license-plugin
* https://github.com/Banno/banno-sbt-plugin

Would there be interest in using those? (Both have a couple of tests.) I don't really see any other sbt plugins here under test.
Hi!

You missing a slash here. This results in following error:

```
[jsonz] --== Extracting dependencies for jsonz ==--
[jsonz] Cloning https://github.combanno/jsonz.git
[jsonz] to /localhome/jenkinsdbuild3/workspace/Community-2.11.x-manual/target-0.9.1/clones/cc2fc81e4a74f584076ca866eaf4f1b217ba8cc6
[jsonz:error] error: Couldn't resolve host 'github.combanno' while accessing https://github.combanno/jsonz.git/info/refs
[jsonz:error] fatal: HTTP request failed
[jsonz:error] java.lang.RuntimeException: Nonzero exit code (128): git clone -n -q https://github.combanno/jsonz.git /localhome/jenkinsdbuild3/workspace/Community-2.11.x-manual/./target-0.9.1/clones/cc2fc81e4a74f584076ca866eaf4f1b217ba8cc6
[jsonz:error] 	at scala.sys.package$.error(package.scala:27)
[jsonz:error] 	at distributed.support.git.GitGit$.distributed$support$git$GitGit$$apply(Git.scala:274)
[jsonz:error] 	at distributed.support.git.GitGit$$anonfun$1.apply$mcV$sp(Git.scala:199)
[jsonz:error] 	at distributed.support.git.GitGit$$anonfun$1.apply(Git.scala:199)
[jsonz:error] 	at distributed.support.git.GitGit$$anonfun$1.apply(Git.scala:199)
[jsonz:error] 	at distributed.utils.Time$.timed(Time.scala:18)
[jsonz:error] 	at distributed.support.git.GitGit$.clone(Git.scala:198)
[jsonz:error] 	at distributed.support.git.GitGit$.clone(Git.scala:184)
[jsonz:error] 	at distributed.support.git.GitProjectResolver.resolve(ProjectResolver.scala:45)
[jsonz:error] 	at distributed.project.resolve.AggregateProjectResolver.resolve(ProjectResolver.scala:57)
[jsonz:error] 	at distributed.support.BuildSystemCore.resolve(BuildSystemCore.scala:18)
[jsonz] --== End Extracting dependencies for jsonz ==--
```