ignore received frames on a stream locally reset for some time (#174)

- Adds config duration for how long to ignore frames on a reset stream
- Adds config for how many reset streams can be held at a time

tests/support/mock.rs

@@ -1,4 +1,4 @@
-use {FutureExt, SendFrame};
+use {frames, FutureExt, SendFrame};
 
 use h2::{self, RecvError, SendError};
 use h2::frame::{self, Frame};
@@ -441,6 +441,15 @@ pub trait HandleFutureExt {
         }
     }
 
+    fn ping_pong(self, payload: [u8; 8]) -> RecvFrame<<SendFrameFut<Self> as IntoRecvFrame>::Future>
+    where
+        Self: Future<Item=Handle> + Sized + 'static,
+        Self::Error: fmt::Debug,
+    {
+        self.send_frame(frames::ping(payload))
+            .recv_frame(frames::ping(payload).pong())
+    }
+
     fn idle_ms(self, ms: usize) -> Box<Future<Item = Handle, Error = Self::Error>>
     where
         Self: Sized + 'static,