mt.hodaka

fix duplicated RxWKNavigationDelegateProxy in RxCocoa and RxWebKit

1

fix #52 This is because `RxWKNavigationDelegateProxy` was duplicated in RxCocoa and RxWebKit. Fixed to use [RxCocoa implementation](https://github.com/ReactiveX/RxSwift/blob/1a1fa37b0d08e0f99ffa41f98f340e8bc60c35c4/RxCocoa/iOS/WKWebView%2BRx.swift#L19-L21).

`$ cartahge bootstrap` was failing due to a broken file references in `project.pbxproj`. Fixed file references so that `$ cartahge bootstrap` now succeeds.

This is to fix #42 Thanks