* Introduce dedicated deserializers for LocationEncodingType and 
  ObservationType instead of handling deserialization of these types in
  ClassDeserializer. Since both LocationEncodingType and ObservationType
  now have a SIMPLE type, "generic" deserialization via the
  ClassDeserializer is no longer possible. Furthermore, having dedicated
  deserializers makes the deserialization process more explicit.
* Fix line lengths in some files and adjust some local variable names.
* Improve Javadoc documentation a bit and describe an observation's
  result more explicitly.