Testing out more environment changes and adding empty setup script

.travis.yml

@@ -1,9 +1,17 @@
 language: bash
 
+os:
+- linux
+- osx
+
+addons:
+  apt:
+    packages:
+    - mono-complete
+
 before_install:
-- sudo apt-get clean
-- sudo apt-get update -qq
-- sudo apt-get install -qq -y mono-complete
+- if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update; fi
+- if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install mono; fi
 - curl https://sh.rustup.rs -sSf -o rustup.rs
 - chmod ugo+x rustup.rs
 - ./rustup.rs -y
@@ -22,7 +30,3 @@ script:
 - ./test/go_lang.go
 - ./test/java_lang.java
 - ./test/rust_lang.rs
-
-os:
-- linux
-- osx

build/car_setup.sh

@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+echo Hello, world!