Fix crash caused by trying to present a survey on top of a viewcontroller that was itself being presented
Move isBeingPresented/Dismissed check inline
Merge pull request #94 from mixpanel/survey-presentation-bug

Fix crash caused by trying to present a survey on top of a viewcontrolle...
Bump version to 2.2.2
Merge branch 'master' of github.com:mixpanel/mixpanel-iphone
Merge branch 'master' into newstex/master