Install PhantomJS 2.1.1 on Travis CI if not available

.travis.yml

@@ -30,13 +30,23 @@ branches:
 cache:
  directories:
  - $HOME/.composer/cache
+ - $HOME/travis_phantomjs
 
 notifications:
  email: false
  slack:
  secure: ixWu6kWtNIlzzdImpu4MdvGYpA6ZPp/dQpMAp6FDO2oHHB55J9ossBYtVtBXPCDs9OxqfQl2yqbE+TkhfIfkZqIbhvX2+CiIomvYSKZDvryUlCfbfV29behmSVIVYvg3b8Tba+nAyZeJA2guUyAy02WGr3n4I+PDgZC3Wa/mv94=
 
-before_install: travis_retry composer selfupdate
+before_install:
+ - travis_retry composer selfupdate
+
+ - phantomjs --version
+ - export PATH=$HOME/travis_phantomjs/phantomjs-2.1.1-linux-x86_64/bin:$PATH
+ - phantomjs --version
+ - if [ $(phantomjs --version) != '2.1.1' ]; then rm -rf $HOME/travis_phantomjs; mkdir -p $HOME/travis_phantomjs; fi
+ - if [ $(phantomjs --version) != '2.1.1' ]; then travis_retry wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-2.1.1-linux-x86_64.tar.bz2 -O $HOME/travis_phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2; fi
+ - if [ $(phantomjs --version) != '2.1.1' ]; then tar -xvf $HOME/travis_phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2 -C $HOME/travis_phantomjs; fi
+ - phantomjs --version
 
 install:
  - if [ "$DEPS" = "normal" ]; then travis_retry composer install --no-interaction; fi;