chore: add release script

Author: eddyerburgh

package.json

@@ -8,6 +8,7 @@
     "dev": "node build/dev-server.js",
     "build": "node build/build.js",
     "unit": "karma start test/unit/karma.conf.js --single-run",
+    "release": "semantic-release",
     "test": "npm run unit",
     "lint:fix": "eslint --ext .js,.vue Clock.vue test/unit/specs --fix"
   },
@@ -74,6 +75,7 @@
     "opn": "^4.0.2",
     "ora": "^0.3.0",
     "phantomjs-prebuilt": "^2.1.3",
+    "semantic-release": "^15.9.17",
     "semver": "^5.3.0",
     "shelljs": "^0.7.4",
     "sinon": "^2.1.0",