Camp server improvements

Simplifies a lot of the camp-server project.

* Uses Guice to inject dependencies. Removes the need to pass the DtoFactory, CampPlatform and ServletContext between resources.
* Configuration done in `CampServletModule`
* Removes `/camp` from `@Path` annotations, injects as `uriBase` instead.
* Removed Rest from the names of the resource classes
* Tests use JerseyTest for simple setup, tear down and querying