use travis to auto-deploy to npm

.travis.yml

 branches:
   only:
-    - master
-    - gh-pages
-
+  - master
+  - gh-pages
 language: node_js
-
 node_js:
-  - "0.10"
-
+- '0.10'
 before_install:
-  - npm install -g grunt-cli recess bower
-  - bower install
-
-script: "grunt swatch"
-
+- npm install -g grunt-cli recess bower
+- bower install
+script: grunt swatch
 git:
   depth: 10
+deploy:
+  provider: npm
+  email: hello@thomaspark.me
+  api_key:
+    secure: E9dTc33u8aHCXG4qd8TrafOiAMzgEJYQUx/bnG2thb4cDD2U64LEdShjkXnjwr2K2RLNfQ4IQWHsDVAvyDK0f9kiud0swoG0SHTU9RDQ+NYFYODZe/c5qOlYqIHoJIpLV3lb7AHrzhrk+G1bkTn7pukB6/nEU0e+D3I7b3kbwEg=
+  on:
+    tags: true
+    repo: thomaspark/bootswatch
+    branch: gh-pages