Added ProxyFor

Added ProxyFor to forward the properties of a e.g. entity object.
- Based on DynamicObject
- Only Properties are forwarded
- PropertyChanged is invoked
Added method binding without parameter

- Extended RelayCommand to accept Action and Func<bool>
- Extended MethodToCommandBinding to forward the method
Added Dialog Title

- Added dialog title to DialogSettings
- Added WPF binding for title
Added Simple Region Concept

- Extended view manager to hold a set of action to manage e.g. the
properties of other view models
Version 0.6.0