removing extra content stack from history when navigating to a book
removing extra content stack from history when navigating to a book

dak/webview,dak/webview,Connexions/webview,katalysteducation/webview,katalysteducation/webview,katalysteducation/webview,dak/webview,Connexions/webview,katalysteducation/webview,Connexions/webview,Connexions/webview