add .travis.yml

+language: node_js
+node_js:
+  - "0.10"
+before_install:
+  - rvm use 1.9.3
+install:
+  - travis_retry npm install -g grunt-cli
+  - travis_retry npm install
+  - travis_retry gem install --no-document "jekyll:~>1.5.0" "sass:~>3.3.3"
+matrix:
+  fast_finish: true