Update UrbanAirship Library to newest version.
Major source code push on iOS v1.7.0.

1. Separate exchange part to safeslingerexchange library project.
2. Update static library including sha3 and openssl for iPhone
simulator use.
3. Create a new project called safeslingerdemo for only exchange demo.
4. Remove old SafeSlinger-Exchange folder.
5. Create new project safeslingermessager for message part only.
6. localizations file for iOS devices.