Update travis.yaml to use nightlies

env:

  global:

    - secure: NUmm2nbBlVozEj4DGiXh7h4HCtCxDl90r6aQUIF+5bfuj0vMBxPVK6tygIZH2eyUQLferssHoAofidGPKAcb6KzWF+EgBqddaXkIS2gDWxHYV1motHn99gqKZVxy7LIxC35THfkXHNu91iJCNRlzZ9rDhogzpwBo6RTqtkdbzq0=

before_install:

  - yes | sudo add-apt-repository ppa:hansjorg/rust

  - sudo apt-get update

install:

  - sudo apt-get install rust-nightly

  - 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)

before_script:

  - openssl s_server -accept 15418 -www -cert test/cert.pem -key test/key.pem >/dev/null &

  - ./configure

script:

  - make all check doc

after_success:

  - curl http://www.rust-ci.org/artifacts/put?t=$RUSTCI_TOKEN | sh