No more allowed failures in integration tests

They have all been working for some time now.

Author: phansch

.travis.yml

@@ -48,7 +48,6 @@ matrix:
     - env: INTEGRATION=serde-rs/serde
     - env: INTEGRATION=Geal/nom
     - env: INTEGRATION=hyperium/hyper
-  allow_failures:
     - env: INTEGRATION=rust-lang/cargo
     - env: INTEGRATION=rust-lang-nursery/rls