refactor: Add additional check for android before adding android imports

[vtrifonov]

Add additional check for android before adding the imports, so that the loader can be used in ios platform as well as this allows us to use a single bundle file for both platforms in the playground

[sis0k0]

Can we use the DefinePlugin to add a global isAndroid variable? That way webpack will be able to remove these imports during build.

[vtrifonov]

The thing is that I don't want webpack to remove these imports during the build as I want to produce a bundle valid for both android and ios platforms

[sis0k0]

Discussed in person:
It makes sense to have one version of the bundle.js file for the playground. This allows us to sync only one file to every connected device (iOS or Android). This won't work with platform-specific files (file.android.js, file.ios.js).