Update for modern Xcode/Swift versions, dark mode support

Merge pull request #506 from vikmeup/fix-416

Avoid crashes when SCLAlertView is called from viewDidLoad

0.8: Fixed a typo (#366)

`style: .Succes` was changed to `style: .succes`

0.7.0: Merge pull request #240 from m-tatsuto/swift3

Swift3

0.6.0: Merge pull request #220 from sagendaz/master

added circular radius to the circleIconView layer

0.5.9: Merge pull request #198 from filmhomage/feature/add_cocoapod_badge_an…

…d_bump_spec

Added cocoapod badge and bump spec

0.5.8

Bump spec

0.5.7: Merge pull request #185 from falkobuttler/feature/add_more_appearance…

…_options

Fixed compile error

0.5.6: Merge pull request #176 from hibento/feature/CustomFont

Struct SCLAppearance for all Properties

0.5.5: Merge pull request #171 from blazierkyle/master

Custom Subview

0.5.4: Merge pull request #166 from peterprokop/master

Fix testing