Not friendly to other sounds playing on the device

[chetstone]

When a song is playing on the music player in the background, and this component is activated to play a sound, the music stops. The sounds should mix.

[npomfret]

Or at least the other audio should resume playing.

[npomfret]

@chetstone try my branch https://github.com/npomfret/react-native-audioplayer