Pushing a KINWebBrowserViewController that has default tintColor and barTintColor corrupts the tint color of the navigation bar.

[bhapca]

Steps to reproduce:

1. Change the viewDidLoad for KINWebBrowserExampleViewController to show the navigation bar, and set a bar tint color for the navigation bar.
2. Load the web browser and notice that it changed the colour of the navigation bar.
3. Go back - notice that the the colour of the navigation bar stays changed. See the attached screenshots and https://github.com/bhapca/KINWebBrowser.git.