RPM package from Serde JARs

To reduce manual work deploying the SerDe on our servers, I'd like to package the built non-test JARs into an RPM. I've added a Maven module that puts the JARs from the other three modules into an RPM. The RPM build is hidden behind a profile, so that it doesn't affect users that don't need it. Furthermore the package uses the _cdh.shim_-Parameter to build either a _hive-json-serde-cdh4_ or _hive-json-serde-cdh5_ RPM.

Regarding e3b31e1: This test failed for me due to the wrong sequence of elements in the String output. I've modified it to check for each element separately.