Made more corrections to Cookie.ToString.

1. Made Cookie Name and Value properties case insensitive
2. Throws exception on illegal Cookie Name
3. Doesn't emit "false" flag values
4. Properly escape key-value attributes.

src/main/java/org/json/Cookie.java

@@ -115,7 +115,7 @@ public static JSONObject toJSONObject(String string) throws JSONException {
      * All other members are ignored.
      * @param jo A JSONObject
      * @return A cookie specification string
-     * @throws JSONException if a called function fails
+     * @throws JSONException thrown if the cookie has no name.
      */
     public static String toString(JSONObject jo) throws JSONException {
         StringBuilder sb = new StringBuilder();