v0.6.0

1. Use crx to pack Chrome Extension. (#9, fda00e1)
2. Use rimraf instead of rm -rf.
3. Use co-mocha to support Generater & Async functions in E2E tests.
4. Add AppVeyor build.
5. Use process.env instead of __DEFINE_ENVS__ in webpack.
6. Update react to 0.14.3.
7. Update redux-devtools to 3.0.0-beta3.
8. Update eslint-config-airbnb to 0.1.0 and update coding style.
9. Add redux-devtools-extension, we can run DEVTOOLS_ENV=1 npm run dev to enable it.