PubNub v3.4.1 official podspec

Hi, 

I'm Vadim, developer who support PubNub library now.
By request of many users we've prepared podspec for our project.
I've tested it with demo's from our main project - it works correctly.
In case of any question - feel free to contact me by email on: osovec7@gmail.com or support@pubnub.com.

Best Regards,
Vadim