Try setting up travis

.travis.yml

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+language: rust
+sudo: required
+dist: trusty
+rust:
+  - nightly
+before_install:
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update          ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install sdl2    ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install openssl ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then sudo chown root:wheel /usr/local/bin/brew ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then sudo brew link sdl2 ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get update -qq ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then sudo apt-get install -y libsdl2-dev libsdl2-mixer-dev libssl-dev gcc ; fi
+script:
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export LIBRARY_PATH="$LIBRARY_PATH:/usr/local/lib"         ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export OPENSSL_INCLUDE_DIR=`brew --prefix openssl`/include ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export OPENSSL_LIB_DIR=`brew --prefix openssl`/lib         ; fi
+  - cargo build --verbose
+  - cargo test --verbose
+os:
+  - linux
+  - osx