Methods for combining vendor, interaction, and event into a codepoint.
Added `willShowInteractionForEvent:` method for determining if an interaction will be shown the next time you engage the given event.
Fixes IOS-512
Fixes #116
Tests for `willShowInteractionForEvent:`
Move photo selection from `clickedButtonAtIndex:` to `didDismissWithButtonIndex:` to fix iOS 8 iPad photo selection issue.
 > Warning: Attempt to present <UIImagePickerController>  on <ATSimpleImageViewController> which is already presenting (null)
http://stackoverflow.com/questions/24942282/uiimagepickercontroller-not-presenting-in-ios-8
Fixes IOS-661
Merge branch 'willShowInteraction' into Next
Modified `willShowInteractionForEvent:` description.
#132
Renamed `engage:(NSString *)...` parameter name from `eventLabel` to `event`.
Fixes IOS-658
Fixing various static analyzer warnings in Xcode 6.0.1.
Merge pull request #133 from wooster/Next

Fixing various static analyzer warnings in Xcode 6.0.1.