Handles orientation change in Memory Graph activity

Author: AkshobhyaP

app/src/main/java/io/neurolab/activities/MemoryGraphParent.java

@@ -5,7 +5,6 @@
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentTransaction;
 import android.support.v7.app.AppCompatActivity;
-import android.widget.Toast;
 
 import io.neurolab.R;
 import io.neurolab.fragments.MemoryGraphFragment;