Adds test for #U4-2207 which will now pass but it will still fail on the website because of the case

sensitive checking for the default proeprty editor lookup. Need feedback from sebastian before continuing

src/Umbraco.Tests/PublishedContent/PublishedContentTestBase.cs

@@ -30,7 +30,7 @@ namespace Umbraco.Tests.PublishedContent
             //need to specify a custom callback for unit tests
             PublishedContentHelper.GetDataTypeCallback = (docTypeAlias, propertyAlias) =>
                 {
-                    if (propertyAlias == "content")
+                    if (propertyAlias.InvariantEquals("content"))
                     {
                         //return the rte type id
                         return Guid.Parse("5e9b75ae-face-41c8-b47e-5f4b0fd82f83");

src/Umbraco.Tests/PublishedContent/PublishedContentTests.cs

@@ -222,6 +222,10 @@ namespace Umbraco.Tests.PublishedContent
 			var propVal2 = doc.GetPropertyValue<IHtmlString>("content");
 			Assert.IsTrue(TypeHelper.IsTypeAssignableFrom<IHtmlString>(propVal2.GetType()));
 			Assert.AreEqual("<div>This is some content</div>", propVal2.ToString());
+
+            var propVal3 = doc.GetPropertyValue("Content");
+            Assert.IsTrue(TypeHelper.IsTypeAssignableFrom<IHtmlString>(propVal3.GetType()));
+            Assert.AreEqual("<div>This is some content</div>", propVal3.ToString());
 		}
 
 		[Test]

src/umbraco.cms/businesslogic/ContentType.cs

@@ -146,7 +146,8 @@ namespace umbraco.cms.businesslogic
 
         public static Guid GetDataType(string contentTypeAlias, string propertyTypeAlias)
         {
-            var key = new System.Tuple<string, string>(contentTypeAlias, propertyTypeAlias);
+            //propertyTypeAlias needs to be invariant, so we will store uppercase
+            var key = new System.Tuple<string, string>(contentTypeAlias, propertyTypeAlias.ToUpper());
 
             
             return PropertyTypeCache.GetOrAdd(