updated rest routing to only match numeric IDs.

eg.
Match: api/series/12
No Match: api/series/abc

NzbDrone.Api/REST/RestModule.cs

@@ -11,7 +11,7 @@ namespace NzbDrone.Api.REST
         where TResource : RestResource, new()
     {
         private const string ROOT_ROUTE = "/";
-        private const string ID_ROUTE = "/{id}";
+        private const string ID_ROUTE = @"/(?<id>[\d]{1,7})";
 
         private Action<int> _deleteResource;
         private Func<int, TResource> _getResourceById;
@@ -56,6 +56,12 @@ namespace NzbDrone.Api.REST
                 _getResourceById = value;
                 Get[ID_ROUTE] = options =>
                     {
+                        int id;
+                        if (!Int32.TryParse(options.Id, out id))
+                        {
+                            throw new NotImplementedException();
+                        }
+
                         var resource = GetResourceById((int)options.Id);
                         return resource.AsResponse();
                     };