added new property Order
added new attribute YamlOrder and implementation of YamlOrder
fixed merge conflicts
added unittests for ordered properties SerializationOfOrderedProperties and DeserializationOfOrderedProperties
removed ordering by name
adapted YamlMember to provide the order priority

- removed YamlOrderAttribute
- adapted YamlMember attribute to provide the order priority
- adapted YamlAttributesTypeInspector to use the YamlMember order property
adapted unittest to the YamlMember order property
Fix tabs mixed with spaces.
Merge pull request #111