Security update for ruby20

This ruby update fixes the following two security issues:

- bnc#902851: fix CVE-2014-8080: Denial Of Service XML Expansion
- bnc#905326: fix CVE-2014-8090: Another Denial Of Service XML Expansion
- Enable tests to run during the build. This way we can compare
the results on different builds.

Fixed bugs
bnc#902851
VUL-0: CVE-2014-8080: ruby: ruby19: Denial Of Service XML Expansion
bnc#905326
VUL-0: CVE-2014-8090: ruby: Another Denial Of Service XML Expansion
Selected Binaries
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