App Maintenance and Fixes for App Update

This set of changes is based off an initial version of the Polldaddy-iOS source.  That source has not been updated in several major version releases of iOS.  These updates target addressing immediate issues related to creating and building an app update for the App Store.

* Added support for iOS 8 SDK with support for iOS 7.0 and higher devices.
* Updated build architectures.
* Addresses build warnings and errors
* Minor updates to look and feel of app icon, default screen, and sign in screen.
* Added minimal support for 4 inch screen form factor.
* Bug fixes