Engagement manifest loading, parsing, etc. (Initial engagement API commit)
#55441536
 - Added Engagement section to FeedbackDemo
 - Added `engage` method stub
Added description to pretty print Interactions
Renamed Interaction `conditions` to `criteria`
 - Building NSPredicate for Interaction criteria
 - Checking if criteria for a given interaction are met
 - Finding best Interaction for given code point
[#55866798]
Live data for interaction and code point usage
 - Default engagement codepoint/interaction data
 - Storing code points and interactions in dictionary
 - Incrementing engagement counters
 - Method for creating easy custom (testing) usage data for a particular codepoint/interaction
- Added `presentInteraction` method (still mostly a stub)
- Updating version install dates
 - Added the new code points to feedback demo (+1 squashed commit)
Squashed commits:
[49a24de]  - Updating version install dates
 - Added the new code points to feedback demo
Adding tests class
Fixing a few memory leak issues
Adding static library bootstrap code for engagement category.
Moving ATEngagement.* into ATConnect.
Adding warning so we don't forget to add UIWebView here.
Merge tag 'v1.1.0' of github.com:apptentive/apptentive-ios

1.1.0 Enterprise Surveys
Add screenshots & modify README.md
Updated survey section with caching and re-organization.
Merge pull request #1 from pkamb/patch-1

Updated survey section with caching and re-organization.