Merge branch '223-fix-bluetooth-android-6' into 'master'

Fix adding contacts with Android 6

Adds `ACCESS_COARSE_LOCATION` permission to manifest. Since API 23 this is required for access to the Bluetooth APIs.

See: https://developer.android.com/intl/ko/about/versions/marshmallow/android-6.0-changes.html#behavior-hardware-id

Closes #223

See merge request !67