stdlib: Add Result and Option types

Since the type checker sucks less now, we can think about maybe
adding some features to the language.

...At some point I'd like to have the type checker clean up
the index map.

stdlib/std.cl

@@ -12,6 +12,10 @@ pub mod num;
 
 pub mod str;
 
+pub mod option;
+
+pub mod result;
+
 pub mod range;
 
 #[cfg("test")]