fixed "dismissModalViewControllerAnimated is deprecated" warning when compiling the SDK with deployment target 6.0
Merge pull request #33 from Soph/develop

fixed warning "dismissModalViewControllerAnimated is deprecated"
fixed deprecation warning for NSString UIKit Constants with iOS6 deployment target
Merge pull request #34 from Soph/develop

fixed deprecation warning for NSString UIKit Constants
Add link to nightly builds.
Update README.md