Add map for sections and pages, update queue to handle function without promise

lib/epubjs/section.js

@@ -5,10 +5,12 @@ EPUBJS.Section = function(item){
     this.index = item.index;
     this.href = item.href;
     this.url = item.url;
-    this.cfiBase = item.cfiBase;
     this.next = item.next;
     this.prev = item.prev;
     
+    this.epubcfi = new EPUBJS.EpubCFI();
+    this.cfiBase = item.cfiBase;
+
     this.hooks = {};
     this.hooks.replacements = new EPUBJS.Hook(this);
 
@@ -118,4 +120,8 @@ EPUBJS.Section.prototype.reconcileLayoutSettings = function(global){
     }
   });
  return settings;
+};
+
+EPUBJS.Section.prototype.cfiFromRange = function(_range) {
+  return this.epubcfi.generateCfiFromRange(_range, this.cfiBase);
 };