Merge branch 'back-facing-camera-not-required' into 'master'

Make back-facing camera optional in manifest

See merge request briar/briar!888

briar-android/src/main/AndroidManifest.xml

@@ -4,7 +4,7 @@
 	xmlns:android="http://schemas.android.com/apk/res/android">
 
 	<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
-	<uses-feature android:name="android.hardware.camera" />
+	<uses-feature android:name="android.hardware.camera" android:required="false"/>
 	<uses-feature android:name="android.hardware.touchscreen" android:required="false" />
 
 	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />