Refactored some Specification methods to be extension methods
Improved Children property and XML parser.
More tests for the XML parser
Added XML parsing playground
Started implementing declarations
Updated Nuget Package

The NuGet package has been updated to version 0.2.9
Sealed the Tokenizers
Added notation declaration in XML tokenizer, started implementing type declaration in XML tokenizer
Element Type Declaration
finished element type declaration tokenization
Improved IoC (adjusted for PCL), refactored constant names, added attribute DTD
Improved doctype (preliminary) and added entity declaration
Merge branch 'master' into pcl

Reworked reflection based mechanisms in DependencyResolver to use correct methods for PCL
Wrote some unit tests for DependecyResolver