Add documentation and minor code-refactoring
added cancel button for navigation controller.
added klarna registration cancelled event handler.
Fix doc and add apiKey validation
add KIAContext test
add test task to travis
switched to Kiwi.
changed file names
added Registration View Controller Spec
Semantic changes in klarna registration view-controller
added klarnaRegistrationCancelled spec
Add test when error is NSURLErrorCancelled
Fix doc
fix documentation
Fix test description and error message
minor changes.
Merge pull request #1 from yuval-netanel/WebView

Add documentation and minor code-refactoring