Adding storybook gh-pages deploy

Author: jonrohan

package.json

@@ -4,6 +4,7 @@
     "postinstall": "npm run bootstrap",
     "start": "start-storybook -p 8000 -c .storybook",
     "storybook": "build-storybook -o build",
+    "publish-storybook": "npm run storybook && gh-pages -d build -b gh-pages -r https://github.com/primer/storybook",
     "bootstrap": "lerna bootstrap --hoist",
     "clean": "lerna clean",
     "distclean": "lerna clean --yes && rm -rf node_modules",
@@ -26,6 +27,7 @@
     "babel-preset-react": "^6.24.1",
     "commit-status": "^4.1.0",
     "css-loader": "^0.28.4",
+    "gh-pages": "^1.0.0",
     "glob": "^7.1.2",
     "html-to-react": "^1.2.11",
     "lerna": "^2.4.0",