codec: update to use std-future (#1214)

Strategy was to

- copy the old codec code that was temporarily being stashed in `tokio-io`
- modify all the type signatures to use Pin, as literal a translation as possible
- fix up the tests likewise

This is intended just to get things compiling and passing tests. Beyond that there is surely
lots of refactoring that can be done to make things more idiomatic. The docs are unchanged.

Closes #1189 

1 files changed, 1 insertions, 1 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 413a3023..7d93dcaf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@
 members = [
   "tokio",
   # "tokio-buf",
-  # "tokio-codec",
+  "tokio-codec",
   "tokio-current-thread",
   "tokio-executor",
   # "tokio-fs",