chore: fix phantomjs for travis

Author: Foxandxss

.travis.yml

@@ -1,5 +1,11 @@
 language: node_js
 node_js:
 - 5.5
-before_install: npm install -g gulp testem
+before_install:
+before_install:
+  - mkdir travis-phantomjs
+  - wget https://bitbucket.org/ariya/phantomjs/downloads/phantomjs-2.1.1-linux-x86_64.tar.bz2 -O $PWD/travis-phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2
+  - tar -xvf $PWD/travis-phantomjs/phantomjs-2.1.1-linux-x86_64.tar.bz2 -C $PWD/travis-phantomjs
+  - export PATH=$PWD/travis-phantomjs/phantomjs-2.1.1-linux-x86_64/bin:$PATH
+  - npm install -g gulp testem
 script: "gulp travis && testem ci -f config/testem.json"