Add IntoBuf trait

examples/into_buf.rs

@@ -0,0 +1,17 @@
+extern crate bytes;
+
+use bytes::{Buf, IntoBuf, Bytes};
+
+pub fn dump<T>(data: &T) where
+    for<'a> &'a T: IntoBuf,
+{
+    let mut dst: Vec<u8> = vec![];
+    data.into_buf().copy_to(&mut dst);
+    println!("GOT: {:?}", dst);
+}
+
+pub fn main() {
+    let b = Bytes::from_slice(b"hello world");
+    dump(&b);
+    dump(&b);
+}