new file:   Lambda.MetaUtils/BidirectionalDictionary.cs
	new file:   Lambda.MetaUtils/MultiBidirectionalDictionary.cs
	new file:   Lambda.MetaUtils/PropertyExtension.cs
	new file:   Lambda.MetaUtils/WeakReference.cs
	modified:   Lambda.MetaUtils/BidirectionalDictionary.cs
	modified:   Lambda.MetaUtils/IObservable.cs
	modified:   Lambda.MetaUtils/IObserver.cs
	modified:   Lambda.MetaUtils/MultiBidirectionalDictionary.cs
	modified:   Lambda.MetaUtils/PropertyExtension.cs
	modified:   Lambda.MetaUtils/WeakReference.cs