fix #199: Remove strongly-typed Get<T> support from configuration

src/Microsoft.Framework.ConfigurationModel/ConfigurationExtensions.cs

@@ -11,13 +11,6 @@ namespace Microsoft.Framework.ConfigurationModel
 {
     public static class ConfigurationExtensions
     {
-#if NET45 || DNX451 || DNXCORE50
-        public static T Get<T>(this IConfiguration configuration, string key)
-        {
-            return (T)Convert.ChangeType(configuration.Get(key), typeof(T));
-        }
-#endif
-
 #if NET45 || DNX451 || DNXCORE50
         /// <summary>
         /// Adds the INI configuration source at <paramref name="path"/> to <paramref name="configuraton"/>.