Add release scripts

package.json

@@ -93,6 +93,12 @@
     "jshint": "jshint lib/**/*.js Gruntfile.js --config",
     "coverage": "istanbul cover _mocha -- test/test --timeout 600000",
     "coverage:upload": "istanbul cover _mocha --report lcovonly -- test/test --timeout 600000 && cat ./coverage/lcov.info | ./node_modules/coveralls-send/bin/coveralls.js",
+    "preversion": "npm test",
+    "postpublish": "git push --tags && git push",
+    "release:pre": "npm version prerelease && npm publish --tag pre",
+    "release:patch": "npm version patch && npm publish",
+    "release:minor": "npm version minor && npm publish",
+    "release:major": "npm version major && npm publish",
     "test:slim-worker-single": "node test/slim/worker/single/build.js && testee test/slim/worker/single/worker.html --browsers firefox --reporter Spec",
     "test:slim-worker-progressive": "node test/slim/worker/progressive/build.js && testee test/slim/worker/progressive/worker.html --browsers firefox --reporter Spec",
     "test:slim-worker-shared": "node test/slim/shared_bundles/build.js && testee test/slim/shared_bundles/worker.html --browsers firefox --reporter Spec",