Add Log Out method

Merge pull request #4 from serhii-londar/add-logout

Add Log Out method

Support Swift 4.2

Support Swift 4.2
Support for XCode 10
Update .podspec
Migrate to WKWebView
Update screenshots

Swift4 and Objective-C support

0.1.1

Update .podpec

First minor release

Add possibility to set navigation bar color

Fix issue with cancel button.

0.0.13

Update .podspec

Completion and failure hendlers call in main queue.

0.0.12

Update .podspec

Dismiss login view controller after completion or failure callback called.

0.0.11

Update .podspec

Fix opening redirect url after receiving code

0.0.10

Update .podspec

Add loading label to progress hud

0.0.9

Update pod version

Fix redirection to app store

0.0.8

Update pod version