Add .travis.yml

Author: ashawley

.travis.yml

@@ -0,0 +1,15 @@
+language: ruby
+cache: bundler
+sudo: false
+rvm:
+ - 2.1
+ - 2.2
+ - 2.3
+ - 2.4
+script:
+ - bundle exec jekyll build
+ - grep johnotander/pixyll _site/index.html
+ - grep post-title         _site/index.html
+ - grep pagination-item    _site/index.html
+ - grep johnotander/pixyll _site/css/pixyll.css
+ - grep 404                _site/404.html