Add weback-dev-server with hot/hmr support

* adds `npm start` / `yarn start` script
* starts a webpack-dev-server using the dev config, served on :3333
* hot reloading (HMR) for react/styles, not working for angular code
* new entry `dev.ts` for dynamic imports of CSS theme (ExtractText does
not work with HMR)
* TS loader pipeline moved out of common to add HMR for react
* applied `hot()` to some react containers (that's their new default
 export, named exports remains for testing)
* added sections to README
* updated yarn.lock

.gitignore

@@ -1,8 +1,10 @@
 node_modules
 npm-debug.log
+yarn-error.log
 coverage/
 .aws-config.json
 awsconfig
+/.awcache
 /dist
 /public/build
 /public/views/index.html