isScreenNarrow support for Android 4.4 and above

Added specific support for Android Chrome & Android >= 4.4

Reference: https://developers.google.com/chrome/mobile/docs/user-agent
Merge pull request #77 from rafabernad/patch-3

isScreenNarrow support for Android 4.4 and above

Reviewed-By: Ben Combee (ben.combee@lge.com)