Add exception conversion to ConverterService- Issue #161
Add content negotiation in StatusFilter
  Remove code which is already done in StatusFilter.java
Extract BeanInfoutils from ThrowableSerializer
Use StatusRepresentation instead of a map (better for documentation)
Verify response entity in tests
Fix GWT Edition
WARNING: StatusService has been removed from GWT Edition
 - Added connegService, metadataService and converterService properties to StatusService and pass them via the constructor instead of the toRepresentation and toStatus methods.
 - Renamed @Status#serializeProperties (default to false) into serialize (default to true).
 - Deprecated Component#statusService in favor of the Application#statusService property.
Updated comments.
Merged pull request #974.