Version 0.10

• add support for Jackson instead of GSON
• Bugfix in MapConverter (it just never worked and always threw an exception)
• JsonEngine no longer closes any reader/writer/streams passed to it. Doing so was never intended.
• internal exceptions are now chained as cause to a de/serialization exception (but still not responded to the client
  because we don't know if they contain sensitive information)
• added some missing registrations for standard from-string parsers
• parsing a path segment now throws PathArgumentParseException which responds its message with a 404 error to the
  client because such errors are not expected to contain sensitive information
• refactoring, including moving classes around to better organize packages
• more unit tests