0.91.2

Features:

• Make defaultPrimitiveOutputKind and defaultObjectOutputKind
  configurable attributes rather than (overridable) properties (#285).
• Allow the "xml" prefix in annotations to be used without explicit
  namespace specification, but implicitly mapped to the xml namespace:
  http://www.w3.org/XML/1998/namespace. Note that while not enforced
  it is not valid to declare the prefix to have any different value.
  Adresses #289.

Changes:

• Tidy up the implementation of the constructors of the
  DefaultSerializationPolicy. This might have slight consequences
  in binary compatibility for (experimental) inheritance.
• Change DelegatingSerializer (in serialutil) to take the serial
  name as parameter as using the delegate is not valid.

Fixes:

• Fix trimming of strings inside a mixed context where there is an
  @XmlIgnoreSpace(true) annotation.
• Fix handling of entity references in handling generic value holders
  (node, compactFragment). This addresses bug #291 with two separate,
  but equivalent errors.