Make project build pass with swift 4.0

- pod update
- Force compile rxcocoa and rxswift with swift 3.2

Pods/RxSwift/RxSwift/Observables/AddRef.swift

@@ -0,0 +1,45 @@
+//
+//  AddRef.swift
+//  RxSwift
+//
+//  Created by Junior B. on 30/10/15.
+//  Copyright © 2015 Krunoslav Zaher. All rights reserved.
+//
+
+final class AddRefSink<O: ObserverType> : Sink<O>, ObserverType {
+    typealias Element = O.E
+    
+    override init(observer: O, cancel: Cancelable) {
+        super.init(observer: observer, cancel: cancel)
+    }
+    
+    func on(_ event: Event<Element>) {
+        switch event {
+        case .next(_):
+            forwardOn(event)
+        case .completed, .error(_):
+            forwardOn(event)
+            dispose()
+        }
+    }
+}
+
+final class AddRef<Element> : Producer<Element> {
+    typealias EventHandler = (Event<Element>) throws -> Void
+    
+    private let _source: Observable<Element>
+    private let _refCount: RefCountDisposable
+    
+    init(source: Observable<Element>, refCount: RefCountDisposable) {
+        _source = source
+        _refCount = refCount
+    }
+    
+    override func run<O: ObserverType>(_ observer: O, cancel: Cancelable) -> (sink: Disposable, subscription: Disposable) where O.E == Element {
+        let releaseDisposable = _refCount.retain()
+        let sink = AddRefSink(observer: observer, cancel: cancel)
+        let subscription = Disposables.create(releaseDisposable, _source.subscribe(sink))
+
+        return (sink: sink, subscription: subscription)
+    }
+}