Changed a rest body spec to take a type instead of a class. This allows parameterized resource types.
Defined a repository interface with an in-memory implementation for server-side storage of rest resource instances.
1. wsdef: contains classes that are used to define a Gson based JSON web service
2. wsclient: contains classes that are used to write a Gson based web-service client
wsf is now only a server-side framework. Moved classes relevant for wsdef and wsclient from it to the individual projects.
