Update ReflectionMappingProvider.cs

#24 also support nested complex properties
Merge pull request #1 from michael-elschner/#24-nested-complex-properties

Update ReflectionMappingProvider.cs
Added possibility to inject query unwrappers
Merge pull request #2 from michael-elschner/custom-query-unwrapping

Added possibility to inject query unwrappers
Merge pull request #1 from michael-elschner/master

Support for nested compley properties