Library updates

- Define library versions in parent pom to allow for easy version updates
- Update spring 3.2.3 to 3.2.4 (resolves AOP memory usage issue)
- Update spring security 3.2.0-RC1 to 3.2.0-RC2
- Update spring data commons core 1.4.1 to 1.6.2
- Update mysql connector from 5.1.25 to 5.1.26
- Define generic library configuration in molgenis-security (moved from molgenis-app-omx)
- Update security config due to library changes