Added support for osx.

.travis.yml

@@ -1,22 +1,15 @@
 language: node_js
-cache: yarn
+cache:
+  yarn: true
+  directories:
+    - node_modules
 node_js:
   - '8.9.3'
-os:
-  - linux
-dist: trusty
-before_install:
-  - whoami
-  - node -v
-  - yarn -v
-  - sudo apt-get install -y libgtk2.0-0 libgtk-3-0 libgconf-2-4 libasound2 libxtst6 libxss1 libnss3 xvfb hunspell-en-us
 install:
   - yarn install --frozen-lockfile
 script:
+  - export SIGNAL_ENV=production
   - yarn generate
-  - Xvfb -ac -screen scrn 1280x2000x24 :9.0 &
-  - export DISPLAY=:9.0
-  - export LC_ALL=en_US
   - yarn test
 env:
   global:
@@ -24,3 +17,17 @@ env:
 sudo: false
 notifications:
   email: false
+
+matrix:
+  include:
+    - name: 'Linux Test'
+      os: linux
+      dist: trusty
+      before_install:
+        - sudo apt-get install -y libgtk2.0-0 libgtk-3-0 libgconf-2-4 libasound2 libxtst6 libxss1 libnss3 xvfb hunspell-en-us
+      before_script:
+        - Xvfb -ac -screen scrn 1280x2000x24 :9.0 &
+        - export DISPLAY=:9.0
+        - export LC_ALL=en_US
+    - name: 'OSX Test'
+      os: osx