5.4.0

Upgrade to react-native-firebase v5.0.0 and react-native 0.57.1 (#61)

* Upgrade to RN57.1

* Upgraded to latest Firebase dependencies

* Upgraded to react-native-firebase 5.0.0

* Removed package-lock.json (for those ppl that use yarn)

* Excluded lock files

* Fixed android build

* Updated index.js to default version

* Minor updates to sync the project as close to a fresh RN generated project as possible

* Disabled Invites pod on iOS because of misconfiguration exception

* Bump Crashlytics pods

* XCode 10 auto-added several AppIcon assets

* Auto updates of XCode 10 + removed Invites files

* Disabled new XCode 10 build system due to incompatibility issues which have not yet been resolved in RN57

* Added script to build Android APKs

* Revert back to RN 0.57.1, as 0.57.2 contains a regression causing the bundler to now work out of the box

facebook/react-native#21490

* [android] update firebase sdk versions

* [android] update to gradle v4.6

* replace old logo

* misc js changes

Merge remote-tracking branch 'origin/master'