Migrated most of the functionality from RazorLibraryCore to UmbracoHelper and updated RazorLibraryCore to call

the methods in UmbracoHelper so we only have to maintain one set of code. Didn't port over the Wrap methods because
I need feedback on these as to what they do/are supposed to do.
Added the Media methods to UmbracoHelper using the media store stuff.

src/Umbraco.Web/PublishedMediaStoreResolver.cs

@@ -0,0 +1,32 @@
+using Umbraco.Core.ObjectResolution;
+
+namespace Umbraco.Web
+{
+	/// <summary>
+	/// An object resolver to return the IPublishedMediaStore
+	/// </summary>
+	internal class PublishedMediaStoreResolver : SingleObjectResolverBase<PublishedMediaStoreResolver, IPublishedMediaStore>
+	{
+		internal PublishedMediaStoreResolver(IPublishedMediaStore publishedMediaStore)
+			: base(publishedMediaStore)
+		{
+		}
+
+		/// <summary>
+		/// Can be used by developers at runtime to set their IContentStore at app startup
+		/// </summary>
+		/// <param name="publishedMediaStore"></param>
+		public void SetContentStore(IPublishedMediaStore publishedMediaStore)
+		{
+			Value = publishedMediaStore;
+		}
+
+		/// <summary>
+		/// Returns the IContentStore
+		/// </summary>
+		public IPublishedMediaStore PublishedMediaStore
+		{
+			get { return Value; }
+		}
+	}
+}