add Extendable to the prelude

Author: thestinger

src/libstd/prelude.rs

@@ -49,6 +49,7 @@ pub use char::Char;
 pub use container::{Container, Mutable, Map, MutableMap, Set, MutableSet};
 pub use hash::Hash;
 pub use iter::Times;
+pub use iterator::Extendable;
 pub use iterator::{Iterator, IteratorUtil, DoubleEndedIterator, DoubleEndedIteratorUtil};
 pub use iterator::{ClonableIterator, OrdIterator};
 pub use num::{Num, NumCast};
@@ -64,7 +65,7 @@ pub use path::WindowsPath;
 pub use ptr::RawPtr;
 pub use ascii::{Ascii, AsciiCast, OwnedAsciiCast, AsciiStr, ToBytesConsume};
 pub use str::{Str, StrVector, StrSlice, OwnedStr, NullTerminatedStr};
-pub use from_str::{FromStr};
+pub use from_str::FromStr;
 pub use to_bytes::IterBytes;
 pub use to_str::{ToStr, ToStrConsume};
 pub use tuple::{CopyableTuple, ImmutableTuple, ExtendedTupleOps};