Enable universal builds

A bug was discovered in d17cc9fa which would raise a failure to push
into the browser's history if a base href was defined. Fix the failure
by removing react-router. Anyway, the usage of react-router was
incorrect because the app must hit the server infrastructure when it
enters a room because the server will choose the very app version then.

React Native provides Platform.

feat(iframeAPI): implement avatar change commands

According to Apple iOS devices with versions < 9.0 are 6%.
https://developer.apple.com/support/app-store/

fix(filmstrip_only): Remove unrelated UI elements

fix(filmstrip_only): JS errors

Redux actions which represent "commands" should be imperative, and those
representing events should use the past tense.

Fixes and adjustments of UI layout

Now that Apple have approved build 1.0.178 for release in the App Store,
the short app version needs to be incremented; otherwise, no new builds
can be uploaded to TestFlight and, respectively, for release in the App
Store.

This prevents the keyboard from showing up right when the app opens.

Fix(RemoteVideo): Fixes remote video menu icon

Adds an option to show watermark only for guests.