Swift 4 conversion

[tzm41]

• Pods dependencies are pointing temporarily to Swift 4 beta releases of RxSwift. Podspec dependencies are not updated yet.
• identifier_name rule of SwiftLint disabled, unless we eventually decide against ip_ prefixes.
• I think the necessity of Integer+Extensions, UnsignedInteger+Extensions, and Mathable could be reconsidered.

This PR is waiting on a stable 4.0 release of RxSwift. According to RxSwift discussions that would be mid-October.

[tzm41]

Waiting on https://github.com/SlatherOrg/slather/pull/321 to allow code coverage report be generated from Xcode 9 build.

[paulrolfe]

Looks like the slather fix got merged. I think this is ready 👍

[tzm41]

Sure, if we are ready for Swift 4

[tzm41]

Need to get more people to review and approve

[bobgilmore]

Do we need to add info the README to show how to point to the last good 3.x-compatible branch? And create said branch?

[paulrolfe]

@tzm41 Definitely need some more reviews and buy-in, agreed.

Good idea @bobgilmore, but doesn't need a new branch, we should just make it clear that 0.8.4 is the last swift 3 version.

[bobgilmore]

@paulrolfe Derp, of course.

Not STRICTLY related to the PR, but worth thinking about - what tag are we planning on using for the Swift 4-compatible release? Not 0.8.5, right? Going to bump to 0.9 or something? Asking because I have a project that I'd like to lock to 3.x-compatible versions, and I'd like (I think) to use ~> in the Podfile, not < 0.8.5

[paulrolfe]

@bobgilmore I value and respect your feedback and approval.

However, pod spec lint is failing, so I think we do need some changes... investigating now 😁

[tzm41]

Our team is definitely very respectful. Thanks guys!

[tzm41]

This PR is waiting on a stable 4.0 release of RxSwift. According to RxSwift discussions that would be mid-October.

[tzm41]

Hmm this is RC.. Are we good to go?

[ghost]

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