fixes image button stretched images
Merge pull request #174 from wilfrem/pr/add-unity-di

Add Unity as IoC plugin
Merge pull request #173 from Elywejnak/master

ImageButton images are badly stretched on iOS
Rest client response wrapper moved, SMS added

Breaking change to REST client interface removing the response wrapper.
SMS added to phone service.
Merge branch 'master' of github.com:XForms/Xamarin-Forms-Labs

Conflicts:
	src/Xamarin.Forms.Labs/Xamarin.Forms.Labs/Xamarin.Forms.Labs.csproj
Added Unity to unit test project

Fixed failed tests. IDependencyContainer is not implemented so those
tests will fail with NotImplemented exception.
Draft for Unity DI container wrapper added

Not part of the project yet
Fix to Rest client
add LoadFromHtmlString to HybridWebView(except Windows Phone. I have no Windows Phone)
fix js to call native not work