Run tests for JSEnvs on 2.11.2 as well as 2.10.4.
Merge pull request #1361 from sjrd/test-jsenvs-with-2.11

Run tests for JSEnvs on 2.11.2 as well as 2.10.4.
Version 0.6.0-M2.
Towards 0.6.0 again.