organize imports after rebase

src/com/owncloud/android/MainApp.java

@@ -33,7 +33,6 @@ import android.os.Bundle;
 import android.os.Environment;
 import android.os.IBinder;
 import android.preference.PreferenceManager;
-import android.util.Log;
 
 import com.owncloud.android.authentication.PassCodeManager;
 import com.owncloud.android.datamodel.ThumbnailsCacheManager;