Remove un-needed permissions and features; bump versionCode and versionName for v6

Remove the following permissions:
vibrate; access coarse location; access fine location; access location
extra commands; read phone state; receive sms; record audio; modify
audio settings; read contacts; write contacts; write external storage;
access network state; get accounts; broadcast sticky.

Remove the following hardware features:
android.hardware.location; android.hardware.location.network; android
hardware.location.gps; android.hardware.microphone;
android.hardware.telephony

Leaving the only required permission:
internet