[glue-wg] Associations added to JSON rendering

I just finished adding Associations objects. I updated the schema and examples in github (https://github.com/OGF-GLUE/JSON) and the Google doc (https://docs.google.com/document/d/1BDemCYaJ2hkYMFvyLyJ8ZiFUwB8tBZESo4KSFT27...). It seems to all work fine - I was a little concerned that the "merging" of multiple Associations (e.g. an AdminDomain object that has Associations defined in both the AdminDomain and Domain schemas) wouldn't work, but it appears to. Warren