Feature/epub title in navbar

Example/Example/ViewController.swift

@@ -33,6 +33,7 @@ class ViewController: UIViewController {
         // See more at FolioReaderConfig.swift
 //        config.canChangeScrollDirection = false
 //        config.enableTTS = false
+//        config.displayTitle = true
 //        config.allowSharing = false
 //        config.tintColor = UIColor.blueColor()
 //        config.toolBarTintColor = UIColor.redColor()

Source/FolioReaderCenter.swift

@@ -268,6 +268,10 @@ open class FolioReaderCenter: UIViewController, UICollectionViewDelegate, UIColl
 
         rightBarIcons.append(contentsOf: [font])
         navigationItem.rightBarButtonItems = rightBarIcons
+
+        if(self.readerConfig.displayTitle){
+            navigationItem.title = book.title()
+        }
     }
 
     func reloadData() {

Source/FolioReaderConfig.swift

@@ -140,6 +140,9 @@ open class FolioReaderConfig: NSObject {
 
     /// Enable TTS (Text To Speech)
     open var enableTTS = true
+
+    /// Display book title in navbar
+    open var displayTitle = false
 
     // hide the page indicator
     open var hidePageIndicator = false