Close right drawer when home is pressed

possible use cases:
- open left drawer
- close left drawer
- navigate up (show map)
In each case, the right drawer should be closed.
If the left drawer is to be opened, this fixes a bug where both drawers would overlap for a second. (Because the right drawer would not be closed until onDrawerOpened has fired)

mobile/src/com/cradle/iitc_mobile/IITC_NavigationHelper.java

@@ -12,6 +12,7 @@ import android.preference.PreferenceManager;
 import android.support.v4.app.ActionBarDrawerToggle;
 import android.support.v4.widget.DrawerLayout;
 import android.text.Html;
+import android.view.MenuItem;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
@@ -296,6 +297,14 @@ public class IITC_NavigationHelper extends ActionBarDrawerToggle implements OnIt
         mDrawerLayout.closeDrawer(mDrawerLeft);
     }
 
+    @Override
+    public boolean onOptionsItemSelected(MenuItem item) {
+        if (item.getItemId() == android.R.id.home)
+            mDrawerLayout.closeDrawer(mDrawerRight);
+
+        return super.onOptionsItemSelected(item);
+    }
+
     public void onPostCreate(Bundle savedInstanceState) {
         // Sync the toggle state after onRestoreInstanceState has occurred.
         syncState();