Readded support for guide rate get and set. This will use a default value of 0.67 sidereal rate. But can be overridden by a user.

Meade.net.Telescope/StringExtensions.cs

@@ -6,5 +6,10 @@ namespace ASCOM.Meade.net
         {
             return int.Parse(str);
         }
+
+        public static double ToDouble(this string str)
+        {
+            return double.Parse(str);
+        }
     }
 }