fix($ssr): Added isPlatformBrowser for vgMedia, to avoid SSR errors.

[dorufurtuna]

653

Description

Angular Universal build with Videogular2 fails at runtime, note: ng serve (as per angualr-cli) still works as expected, the error only occurs using npm run serve:ssr (as per angular-universal).

Checklist

Please, check that you have been followed next steps:

• [x] I've read the (contributing)[https://github.com/videogular/videogular2/blob/master/CONTRIBUTING.md] guidelines
• [x] Code compiles correctly (run npm start)
• [X] Created tests (if necessary)
• [X] All tests passing (run npm test)
• [X] Extended the README / documentation (if necessary)

[C0ZEN]

@DoruFurtuna why did you closed it ?