0.3.3

• JSON and XML datetime serialization fixes and improvements
• replacing archetype_slots and use node in the Flattener now maintains the order of the attribute correctly
• fix a ConcurrentModificationException in the Flattener
• fix in operational template with reference to the original archetype in case of overlay replacement
• many rule evaluation fixes:
  • the grammar no longer needs ';' to separate assertions, and no longer needs 'satisfies' after the for_all keyword
  • support for string literals
  • support for /path/to/boolean = "String value", also with boolean values
  • the < and <= operators were <= and < respectively, now work correctly
  • = and != now have precedence over the other comparison operators
  • better path parsing, less ambiguity warnings