Fix for  #484 (RegisterWebApiModelBinders has no effect in Web API 2)

Added a registration of model binders AsSelf() as Web API gets binders from the container by binder's type.
Merge pull request #535 from alexandrnikitin/Issue484_RegisterWebApiModelBinders_Bug_2

Added a registration of model binders AsSelf() as Web API gets binders from the container by binder's type. That solves the issue with ModelBinderAttribute.