Fixed unused import warning in tests

Author: Kimundi

src/libstd/option.rs

@@ -494,7 +494,7 @@ mod tests {
     use super::*;
 
     use result::{IntoResult, ToResult};
-    use result::{Result, Ok, Err};
+    use result::{Ok, Err};
     use str::StrSlice;
     use util;
 

src/libstd/result.rs

@@ -415,7 +415,7 @@ mod tests {
 
     use iter::range;
     use option::{IntoOption, ToOption, AsOption};
-    use option::{Option, Some, None};
+    use option::{Some, None};
     use vec::ImmutableVector;
     use to_str::ToStr;