Remove some WordPressKit imports that were not used (#765)

Author: mokagio

Demo/AuthenticatorDemo/ViewController+WordPressAuthenticator.swift

@@ -1,7 +1,6 @@
 import AuthenticationServices
 import WebKit
 import WordPressAuthenticator
-import WordPressKit
 
 extension ViewController {
 

WordPressAuthenticator/NUX/Button/NUXStackedButtonsViewController.swift

@@ -1,5 +1,4 @@
 import UIKit
-import WordPressKit
 
 struct StackedButton {
     enum StackView {

WordPressAuthenticator/Services/LoginFacade.m

@@ -3,11 +3,8 @@
 #import "WordPressComOAuthClientFacade.h"
 #import "WordPressXMLRPCAPIFacade.h"
 #import "WPAuthenticator-Swift.h"
-
 @import WordPressKit;
 
-
-
 @implementation LoginFacade
 
 @synthesize delegate;

WordPressAuthenticator/Services/WordPressComOAuthClientFacade.m

@@ -1,10 +1,7 @@
 #import "WordPressComOAuthClientFacade.h"
 #import "WPAuthenticator-Swift.h"
-
 @import WordPressKit;
 
-
-
 @interface WordPressComOAuthClientFacade ()
 
 @property (nonatomic, strong) WordPressComOAuthClient *client;