Made the warnings stricter.
Fixed the "weak property may be unpredictably set to nil" warning.
Fixed the conversion warnings.
Fixed the "no new line at the end of file warning"
Added the default 568h launch image to the app.
Resolved the unused parameter warnings in the app delegate.
Fixed an analyser warning about emails being possibly NULL.
Merge pull request #6 from maciejtrybilo/otherWarnings

Fixed other warnings in the code.