try travis build on both linux and osx in one branch

Author: ievgrafov

.travis.yml

@@ -2,22 +2,42 @@ notifications:
   email: false
 language: ruby
 sudo: required
+os:
+  - linux
+  - osx
 rvm:
   - ruby-2.0.0-p648
-  - ruby-2.1.8
+  - ruby-2.0.0-p598
   - ruby-2.2.4
+  - ruby-2.2.2
   - ruby-2.3.0-preview2
   - jruby-head
+matrix:
+  exclude:
+    - os: linux
+      rvm: ruby-2.0.0-p598
+    - os: linux
+      rvm: ruby-2.2.2
+    - os: osx
+      rvm: ruby-2.2.4
+    - os: osx
+      rvm: ruby-2.0.0-p648
+    - os: osx
+      rvm: ruby-2.3.0-preview2
 env:
   - JRUBY_OPTS="-Xcli.debug=true --debug"
 addons:
   code_climate:
     repo_token: 60d9731d654527cb53aabc7db15bcde87d701ddb6b1cba8fc0da6aba16d00bb1
 before_install:
-  - sudo add-apt-repository "deb http://cz.archive.ubuntu.com/ubuntu vivid main universe"
-  - sudo apt-get update -q
-  - sudo rm -rf /etc/dpkg/dpkg.cfg.d/multiarch
-  - sudo apt-get install gnuplot5
+  - if [[ "$TRAVIS_OS_NAME" != "osx" ]]; then sudo add-apt-repository "deb http://cz.archive.ubuntu.com/ubuntu vivid main universe" ; fi
+  - if [[ "$TRAVIS_OS_NAME" != "osx" ]]; then sudo apt-get update -q ; fi
+  - if [[ "$TRAVIS_OS_NAME" != "osx" ]]; then sudo rm -rf /etc/dpkg/dpkg.cfg.d/multiarch ; fi
+  - if [[ "$TRAVIS_OS_NAME" != "osx" ]]; then sudo apt-get install gnuplot5 ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew update ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install pdflib-lite ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install gnuplot --with-png --with-jpeg --with-cairo --with-svg ; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then ulimit -S -n 4096 ; fi
   - gem update bundler
   - bundle install
 install: