Merge pull request lightbend#138 from fnuecke/master

Added ConfigRenderOptions entry for value sorting in objects.

Author: havocp

config/src/main/java/com/typesafe/config/impl/SimpleConfigObject.java

@@ -7,6 +7,7 @@
 import java.io.Serializable;
 import java.util.AbstractMap;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
@@ -382,7 +383,9 @@ protected void render(StringBuilder sb, int indent, boolean atRoot, ConfigRender
             }
 
             int separatorCount = 0;
-            for (String k : keySet()) {
+            String[] keys = keySet().toArray(new String[size()]);
+            Arrays.sort(keys);
+            for (String k : keys) {
                 AbstractConfigValue v;
                 v = value.get(k);