Update PubNub to 3.5.5

Hi,

I've read instruction you have pointed me( http://blog.cocoapods.org/Repairing-Our-Broken-Specs-Repository/ a) to fix my repository. But I still see "Error checking merge status" - when I making pull request. Then I even remove my forked copy and forked origin Spec repository again, thank update podspec and make pull request. I see the same error. 
If you cannot merge this pull request as well - let me know what I need to do then.

Best Regards,
Vadim