enable write to external storage
Merge branch 'master' of https://github.com/danwiding/one-beat-android

Conflicts:
	StreamingAudioGradle/app/src/main/java/com/onebeat/StreamingAudio/activities/TrainActivity.java
	StreamingAudioGradle/app/src/main/java/com/onebeat/StreamingAudio/activities/VibrationPlayActivity.java