Use rustfmt to enforce consistent formatting

This change adds a .rustfmt.toml that includes ALL supported settings,
12 of which we have overridden to attempt to cater to our own
proclivities.

rustfmt is checked in the rust-nightly CI job.

src/frame/reset.rs

@@ -1,6 +1,6 @@
-use frame::{self, Head, Error, Kind, StreamId, Reason};
+use frame::{self, Error, Head, Kind, Reason, StreamId};
 
-use bytes::{BufMut, BigEndian};
+use bytes::{BigEndian, BufMut};
 
 #[derive(Debug, Eq, PartialEq)]
 pub struct Reset {
@@ -32,13 +32,15 @@ impl Reset {
         let error_code = unpack_octets_4!(payload, 0, u32);
 
         Ok(Reset {
-            stream_id: head.stream_id(),
-            error_code: error_code,
-        })
+               stream_id: head.stream_id(),
+               error_code: error_code,
+           })
     }
 
     pub fn encode<B: BufMut>(&self, dst: &mut B) {
-        trace!("encoding RESET; id={:?} code={}", self.stream_id, self.error_code);
+        trace!("encoding RESET; id={:?} code={}",
+               self.stream_id,
+               self.error_code);
         let head = Head::new(Kind::Reset, 0, self.stream_id);
         head.encode(4, dst);
         dst.put_u32::<BigEndian>(self.error_code);