SEC-2118: Fixing spring and aspectj OSGi version ranges [3.2, 3.2) -> [3.2, 3.3)
SEC-2118: Include missing Bundlor packages
Add CONTRIBUTING.md
Update CONTRIBUTING.md

Updated link to github pull requests
SEC-2138: Fix code snippet in Hierarchical Roles section

The bean definition of RoleHierarchyVoter was syntactically incorrect.
Merge branch 'master' of https://github.com/SpringSource/spring-security