Removing *alpha quality* from README

… so we can tag this 1.0.

I mostly wanted to tag HEAD to update the CocoaPod spec.

That being said, if there's anything that prevents the current state of affairs from being "a proper 1.0" , let me know. 
Tagging it 0.5 would also work, I don't feel too strongly about this.

Getting in #21 would be nice, too.