Added "Load Image" enable/disable setting

This setting got removed as part of the UI redesign. Adding it
back.

CR-Fixed: 787818

Change-Id: I4449c2c91e5efbbfa2689ae4ec80050a58ba3f8d
diff --git a/res/xml/general_preferences.xml b/res/xml/general_preferences.xml
index f229197..d65549d 100644
--- a/res/xml/general_preferences.xml
+++ b/res/xml/general_preferences.xml
@@ -176,6 +176,12 @@
                 android:key="default_text_encoding"
                 android:title="@string/pref_default_text_encoding" />
 
+            <CheckBoxPreference
+                android:key="load_images"
+                android:defaultValue="true"
+                android:title="@string/pref_content_load_images"
+                android:summary="@string/pref_content_load_images_summary" />
+
         </PreferenceScreen>