Some Yaml Fixes & Improved Twig Support

This release improves Twig support and fixes a bug in Yaml serialization.

Further Compatibility Updates and Bug Fixes

This release contains updates for newer PHP versions, and also fixes a few edge-cases. Notable in this release:

• adds convenience toArray and fromArray methods to the Serializer
• better handling of polymorphic objects in collections
• fixes some bugs in the YAML metadata format

Some Features & Fixes

Additions:

• Support for is* and has* methods when changing the accessor policy
• Support for defining the XML namespace on the root node
• Ability to set-up your own driver via the SerializerBuilder
• Better parse error for annotated types

Fixes:

• Several documentation fixes

Misc:

• Composer constraints have been widened to allow to pick more recent versions of dependencies

Several Feature Additions & Bug Fixes

• Native Support for XML Namespaces
• Ability to force type of elements in arrays when serializing
• Usage improvements for YML metadata format (shorter, less verbose for simple things)
• Allow Read-Only to be defined on class level
• Several Improvements to the documentation

Feature Improvements & Enhanced Compatibility

This release contains mostly improvements to existing features and better compatibility for third-party libraries in particular PHPCR.

0.13.0: Merge pull request #130 from youngguns-nl/datatime_doc

fix wrong quote in used in docs