fix base/rest service - cleanup + new config file

src/Umbraco.Web/BaseRest/Configuration/ExtensionElementCollection.cs

@@ -0,0 +1,49 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Configuration;
+
+namespace Umbraco.Web.BaseRest.Configuration
+{
+	[ConfigurationCollection(typeof(ExtensionElement), CollectionType = ConfigurationElementCollectionType.BasicMapAlternate)]
+	public class ExtensionElementCollection : ConfigurationElementCollection
+	{
+		const string Key_Extension = "extension";
+
+		public override ConfigurationElementCollectionType CollectionType
+		{
+			get { return ConfigurationElementCollectionType.BasicMapAlternate; }
+		}
+
+		protected override string ElementName
+		{
+			get { return Key_Extension; }
+		}
+
+		protected override bool IsElementName(string elementName)
+		{
+			return elementName.Equals(Key_Extension, StringComparison.InvariantCultureIgnoreCase);
+		}
+
+		protected override ConfigurationElement CreateNewElement()
+		{
+			return new ExtensionElement();
+		}
+
+		protected override object GetElementKey(ConfigurationElement element)
+		{
+			return ((ExtensionElement)element).Alias;
+		}
+
+		public override bool IsReadOnly()
+		{
+			return false;
+		}
+
+		new public ExtensionElement this[string index]
+		{
+			get { return (ExtensionElement)BaseGet(index); }
+		}
+	}
+}