Make generation fail if creating request or response body fails

Handle creating Calendar and Set objects; update the version number;
use newer library versions; do some tidying up.

!BUG:MUSAPI-89
!TESTS:
When run on an old version of api (for example, Ecke-2) it would
generate something like the following as the request body for
POST /groups:

Failed to generate the request body example out of the request parameter type.
Parameter type: com.mediagraft.podsplice.rest.commands.GroupCreateCommand.

But now it should fail.

When run on a new version of api it should not fail for any class.
Fix review comments

!IGNORE
Merge pull request #20 from brucegodden/MUSAPI-89

Make generation fail if creating request or response body fails