Rescue from URI error

It sometimes happen that the URI fails to parse in the `same_origin?` call for some reason. Not sure why, but this will default the `same_origin?` to a sane default.

One such URL is: `https://checkout.shopify.com/2577737/policies/1172141?__utma=1.1044498411.1406634492.1406634492.1406644613.2&__utmb=1.10.10.1406644613&__utmc=1&__utmx=-&__utmz=1.1406644613.2.2.utmcsr=l.facebook.com|utmccn=(referral)|utmcmd=referral|utmcct=/l.php&__utmv=-&__utmk=256236555`

![screen shot 2014-07-29 at 11 31 43 am](https://cloud.githubusercontent.com/assets/2053039/3737278/7cff2fa4-1735-11e4-96cd-62ea5bfe7428.png)