Add ObtainAuthTokenAsString API to C# interface

CASA-auth-token/client/csharp-api/Novell.Casa.Authtoken/Authtoken.cs

@@ -75,6 +75,19 @@ namespace Novell.Casa.Client.Auth
 		{
 		}
 
+        public static string ObtainAuthTokenAsString(string sService, string sHost)
+        {
+            byte[] baToken;
+            baToken = ObtainAuthToken(sService, sHost, null);
+            if (baToken != null)
+            {
+                return (Encoding.ASCII.GetString(baToken));
+            }
+            else
+            {
+                return null;
+            }
+        }
 
 		public static byte[] ObtainAuthToken(string sService, string sHost)
 		{