add all addons to GoCart by default

Fix "Only variables should be passed by reference" error

Merge branch 'master' of https://github.com/gocart/GoCart3

Corrected mistake with Channel Islands

Added Channel Islands to countries and zones

Add filter to avoid MySQL error

Update sitemap_xml_foot.php

Merge pull request #35 from gocart/staging

Merge branch 'staging'

Merge branch 'master' into staging

Fixed a gocart.php bug related to one time use coupons.

Merge pull request #33 from gocart/staging

Update saveCart steps to avoid coupon/shipping bugs

update version

Change default address format out with twig template.