Swift 5 (#108)

* migrate to Swift 5 and Xcode 10.2

* Bump podspec

* Bump CI Xcode version

Add `CaseIterable` table/collectionview helpers (#107)

* Add a bunch of convenience methods on `CaseIterable` + tests

* Add demo VC for CaseIterable stuff

* Document CaseIterable helpers

* Bump podspec

* `in: indexPath -> `at: indexPath`

* clarify caseNames so they don't look like array methods

Swift 4.2 (#106)

* begin the 4.2ening

* don't include the info.plist in the test target

* Run 4.2 auto-migrator

* fix typing for nib options

* Update to Swift 4.2 for tvOS

* add podspec to metadata folder, bump to next version

* add circle config to metadata folder, bump to using xcode 10

* Delete empty test file

* use .first instead of [0] to avoid IOOB crashes

Update for Xcode 9.3 + Circle 2.0 (#105)

* update CI

* Update for 9.3, reorganize, get tests passsing

* put case declarations back to single line

* put back one-line `allItems` declaration

Make tvOS framework build again

Improve iOS only code

Update SweetUIKit.podspec

Update SweetUIKit.podspec

Fix compatibility issues

Update SweetUIKit.podspec