(js,css) Improve keyboard shortcuts

- Defined some hotkeys in all modules;
- Added generation of cheat sheet.

UI/WebServerResources/js/Contacts/AddressBook.service.js

@@ -212,7 +212,7 @@
       this.$$cards = [];
     }
     this.idsMap = {};
-    this.$cards = []; // TODO Keep the "selected" state of cards
+    this.$cards = [];
     // Extend instance with all attributes of data except headers
     angular.forEach(data, function(value, key) {
       if (key != 'headers' && key != 'cards') {
@@ -370,6 +370,16 @@
     return _.find(this.$cards, function(card) { return card.id == _this.selectedCard; });
   };
 
+  /**
+   * @function $selectedCardIndex
+   * @memberof AddressBook.prototype
+   * @desc Return the index of the currently visible card.
+   * @returns a number or undefined if no card is selected
+   */
+  AddressBook.prototype.$selectedCardIndex = function() {
+    return _.indexOf(_.map(this.$cards, 'id'), this.selectedCard);
+  };
+
   /**
    * @function $selectedCards
    * @memberof AddressBook.prototype