Remove h2-test-support crate (#119)

The h2-test-support caused the unstable flag to always be enabled.

tests/support/util.rs

@@ -0,0 +1,41 @@
+use h2::client;
+
+use bytes::Bytes;
+use futures::{Async, Future, Poll};
+
+pub fn wait_for_capacity(stream: client::Stream<Bytes>, target: usize) -> WaitForCapacity {
+    WaitForCapacity {
+        stream: Some(stream),
+        target: target,
+    }
+}
+
+pub struct WaitForCapacity {
+    stream: Option<client::Stream<Bytes>>,
+    target: usize,
+}
+
+impl WaitForCapacity {
+    fn stream(&mut self) -> &mut client::Stream<Bytes> {
+        self.stream.as_mut().unwrap()
+    }
+}
+
+impl Future for WaitForCapacity {
+    type Item = client::Stream<Bytes>;
+    type Error = ();
+
+    fn poll(&mut self) -> Poll<Self::Item, ()> {
+        let _ = try_ready!(self.stream().poll_capacity().map_err(|_| panic!()));
+
+        let act = self.stream().capacity();
+
+        println!("CAP={:?}", act);
+
+        if act >= self.target {
+            return Ok(self.stream.take().unwrap().into());
+        }
+
+        Ok(Async::NotReady)
+    }
+}