language: rust
rust:
    - stable
    - beta
    - nightly

matrix:
    allow_failures:
        - rust: nightly

language: rust
rust:
    - stable
    - beta
    - nightly
os:
    - linux
    - osx
matrix:
    allow_failures:
        - rust: nightly

Add osx build to Travis CI configuration
Add osx build to Travis CI configuration
