(+) CTL-290 Added UICompositionService for Prism extensions and also marked the Activate and Deactivate methods from UIVisualizerServiceExtensions as obsolete
Updated Prism NET45 and SL5 project files
Merge branch 'feature/CTL290_Prism' into develop

Conflicts:
	doc/history.txt
	src/Catel.Extensions.Prism/Catel.Extensions.Prism.NET40/Extensions/IUIVisualizerServiceExtensions.cs
	src/Catel.Test/Catel.Test.NET40/Extensions/Prism/UIVisualizerServiceExtensionsTests.cs