switch to major version oro-server 0.5.0.
switch to major version oro-server 0.5.0.

Main changes since 0.4.0:
- Declaration of news ontology services (like add, find, query...) vastly simplified. They must simply be declared with the @RPC_Method Java annotation, their parameters must be limited to strings, integers, booleans, floats, set or list of strings, map of
(string, string), and they can return any of these types + objects that implement specific serializers (see YarpSerializable and JsonSerializable).
- Implementation of a JSON server.
- A lot of new services, including "lookup" to find a concept from its name or label in several languages, "subclassesof", "superclassesof" that returns the hierarchy of a concept.
- First implementation of a memory manager: concepts may be added with a specific lifespan. After a while, the are removed from the knowledge base.
- A lot of bug correction, error handling.

severin-lemaignan/oro-server