HashMap::with_capacity_and_hasher has the wrong-ordered arguments

http://static.rust-lang.org/doc/master/collections/hashmap/struct.HashMap.html#method.with_capacity_and_hasher

``` rs
fn with_capacity_and_hasher(hasher: H, capacity: uint) -> HashMap<K, V, H>
```

If the name is `with_capacity_and_hasher`, the arguments should really be in the same order.
