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

Merge branch 'BeatC-moving-conference-init-to-react-1' of https://github.com/BeatC/jitsi-meet into BeatC-BeatC-moving-conference-init-to-react-1

Merge branch 'no-welcome-autofocus' of https://github.com/saghul/jitsi-meet into saghul-no-welcome-autofocus

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