* Add audio uploads
Fix#4827
Accept uploads of OGG, WAV, FLAC, OPUS and MP3 files, and converts
them to OGG. Media attachments get a new `audio` type. In the UI,
audio uploads are displayed identically to video uploads.
* Improve code style
* Replace browserify with webpack
* Add react-intl-translations-manager
* Do not minify in development, add offline-plugin for ServiceWorker background cache updates
* Adjust tests and dependencies
* Fix production deployments
* Fix tests
* More optimizations
* Improve travis cache for npm stuff
* Re-run travis
* Add back support for custom.scss as before
* Remove offline-plugin and babili
* Fix issue with Immutable.List().unshift(...values) not working as expected
* Make travis load schema instead of running all migrations in sequence
* Fix missing React import in WarningContainer. Optimize rendering performance by using ImmutablePureComponent instead of
React.PureComponent. ImmutablePureComponent uses Immutable.is() to compare props. Replace dynamic callback bindings in
<UI />
* Add react definitions to places that use JSX
* Add Procfile.dev for running rails, webpack and streaming API at the same time
