Update to libwebp 0.4
Fix stack overflow exception from accidental recursive call (introduced with extension method refactoring)
Don't nullref when passed a ~/aspnet path outside of ASP.NET. Drop the tilde and pass to the virtual path providers.
Expose LoadNativeDependenciesForType(Type t) from Config.Plugins. Previously there was no code-based method to load a native dependency manually.
Add Config.Current.Build(ImageJob job) convenience method.
Update WebP native dependencies to 0.4.0

Add ImageResizer.Plugins.WebP.Test project.
Fixed: WIC builder no longer throws a NullReferenceException when provided a null stream. (This was preventing the correct error message)
Migrate Core.Tests from MbUnit to xUnit
Fix NullRef when calling TranslatePoints or GetFinalSize. Introduced during .NET 4.5 refactor, this bug hasn't been released.
Prevent nullref when VirtualFolder is used outside of an ASP.NET application.
Fix "The given stream is not writeable" - typo introduced during .NET 4.5 refactoring.
Convert ImageResizer.AllPlugins from MbUnit to XUnit
Convert CopyMetadata.Tests from MbUnit to xUnit
First attempt at AppVeyor unit test support.
AppVeyor: don't leave the submodules behind!
Appveyor: Try without shallow cloning?
Update referenced version of libwebp
AppVeyor: Correct version numbers; try using depth-limited clone for speed.
Delete MediumTrustTest; it's no longer useful as medium trust is unsupported in V4.
Update xunit + fsunit nuget references.