feat(http): allow specifying custom body streams

src/http/body.rs

@@ -1,5 +1,4 @@
 use std::convert::From;
-use std::sync::Arc;
 
 use tokio_proto;
 use http::Chunk;
@@ -65,12 +64,6 @@ impl From<Vec<u8>> for Body {
     }
 }
 
-impl From<Arc<Vec<u8>>> for Body {
-    fn from (vec: Arc<Vec<u8>>) -> Body {
-        Body(TokioBody::from(Chunk::from(vec)))
-    }
-}
-
 impl From<&'static [u8]> for Body {
     fn from (slice: &'static [u8]) -> Body {
         Body(TokioBody::from(Chunk::from(slice)))