Update DelegatingGraphDatabase.java

Empty constructor needed by Java EE CDI to treat this class as a bean
Create beans.xml

Needed by Java EE CDI to activate bean discovery
Update Neo4jConfiguration.java

@Produces annotation on the graphDatabase() method needed by Java EE CDI to properly instantiate a GraphDatabase bean.
Merge pull request #185 from remigio/patch-4

Patch 4