Initial work to implement application-wide theme.
Fixed discovery of app theme name.
Fixed shim for Fayde Controls in test site.
Fixed retrieval of theme style. Was using instance instead of DefaultStyleKey.
Fixed applying (specifically swapping) of implicit styles in ImplicitStyleBroker.
Now swapping out theme for entire visual tree when application ThemeName is changed.
Moved style swapping so LocalStyle and ImplicitStyle brokers could utilize same code.
Style swapper was hardcoded to set implicit style value. Fixed.
Properly detaching visual tree when template is changed.
Updated controls showcase with new configuration for themes.
Fixed DataTemplate to have DataType instead of TargetType.
Fixed #34.  Pushed nuget package (0.9.7.24).
Updated Fayde package with 0.9.8.
Merge branch 'theming'

Conflicts:
	Demos/ControlsShowcase/ControlsShowcase.csproj
	Demos/ControlsShowcase/lib/Fayde/Fayde.js
	Demos/ControlsShowcase/packages.config
	Packages/Nuget/Fayde/content/lib/Fayde/Fayde.js
	Packages/Nuget/Fayde/version.txt
	Source/Fayde.Client/Xaml/XamlDocument.ts
	Source/Fayde.Tests/tests/DataTemplateTests.js