Fixed code generation for managed bean aspects.

In case the entity has a list instead of a set as field, the managed bean aspect is generated incorrectly and causes
compile errors. The problem is solved by considering the field list type in org.springframework.roo.addon.jsf.managedbean.JsfManagedBeanMetadata.
Merge branch 'master' of https://github.com/shiruba/spring-roo into HEAD