[HTTPS-Everywhere] https ruleset for xoskins.com

[joe at xoskins.com]

I have added and tested the xml ruleset for xoskins.com and it does work.
<ruleset name="XO Skins">
  <rule from="^http://xoskins\.com" to="https://xoskins.com"/>
  <rule from="^http://www\.xoskins\.com" to="https://xoskins.com"/>
</ruleset>

Please add this. Thank you