Fix .travis.yml to use rustup.

.travis.yml

@@ -2,20 +2,12 @@ env:
   global:
     - secure: GwyxF8F9NKc9M2YypZZMGyIolTf7lDfeKnhhGre28HuzE4e9oIB7dUGjqYrx6uQ/ei++rpd+pjhTFilnX5inS/E+7R7DRvdX00JERWPF+qgiWpxPAoT/iI2RQ+7PKiLcwrzdzQIhSfIse/FikdpkeSY0FJG9/vu/HXNzFxDBPW0=
 language: c
-before_install:
-  - yes | sudo add-apt-repository ppa:cmrx64/cargo
 install:
   - sudo apt-get update
-  - sudo apt-get install cargo
+  - curl -s http://www.rust-lang.org/rustup.sh | sudo sh
   - export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib 
-  - curl -O http://static.rust-lang.org/dist/rust-nightly-x86_64-unknown-linux-gnu.tar.gz
-  - tar xfz rust-nightly-x86_64-unknown-linux-gnu.tar.gz
-  - (cd rust-nightly-x86_64-unknown-linux-gnu/ && sudo ./install.sh)
 script:
   - rustc --version
   - make
-  - make test
-  - make bench
-  - make doc
 after_script:
   - curl http://www.rust-ci.org/artifacts/put?t=$RUSTCI_TOKEN | sh