added ability to show/hide next/previous buttons on a tour as well as…

… a step level

set scroll behavior to auto to not show the scrollbar if it's not needed

dist/nz-tour.css

@@ -23,7 +23,7 @@ nz-tour #nzTour-box-wrap {
 nz-tour #nzTour-box {
   width: 250px;
   min-height: 69px;
-  max-height: 120px;
+  max-height: 500px;
   padding: 0.5em;
   background: #fff;
   -webkit-box-shadow: 0 6px 19px 2px rgba(0,0,0,0.14);
@@ -182,7 +182,7 @@ nz-tour #nzTour-content {
   height: 100%;
   max-height: 104px;
   overflow-x: hidden;
-  overflow-y: scroll;
+  overflow-y: auto;
   position: relative;
   border-bottom: solid 32px transparent;
   -webkit-box-shadow: inset 0 -20px 20px -20px rgba(0,0,0,0.2);

dist/nz-tour.js

@@ -24,7 +24,9 @@
                 finishText: 'Finish',
                 animationDuration: 400,
                 placementPriority: ['bottom', 'right', 'top', 'left'],
-                disableHotkeys: false
+                disableHotkeys: false,
+                showPrevious: true,
+                showNext: true
             },
             current: false,
             body: angular.element('body'),
@@ -263,8 +265,8 @@
                 '           <div id="nzTour-inner-content"></div>',
                 '        </div>',
                 '        <div id="nzTour-actions">',
-                '            <button id="nzTour-previous" ng-show="view.step > 0" ng-click="previous()">{{view.previousText}}</button>',
-                '            <button id="nzTour-next" ng-show="view.step >= 0" ng-click="next()" class="success">{{view.nextText}}</button>',
+                '            <button id="nzTour-previous" ng-show="view.step > 0 && view.showPrevious" ng-click="previous()"> ng-click="previous()">{{view.previousText}}</button>',
+                '            <button id="nzTour-next" ng-show="view.step >= 0 && view.showNext" ng-click="next()" class="success">{{view.nextText}}</button>',
                 '        </div>',
                 '    </div>',
                 '</div>',
@@ -391,9 +393,11 @@
                             prevent(e);
                             return;
                         case 27:
-                            $scope.stop();
-                            prevent(e);
-                            return;
+                            if (!config.disableEscExit) {
+                                $scope.stop();
+                                prevent(e);
+                                return;
+                            }
                         case 38:
                         case 40:
                             onWindowScrollDebounced();
@@ -482,7 +486,9 @@
                         step: step,
                         length: steps.length,
                         previousText: config.previousText,
-                        nextText: step == steps.length - 1 ? config.finishText : config.nextText
+                        nextText: step == steps.length - 1 ? config.finishText : config.nextText,
+                        showNext: steps[step].showNext === undefined ? config.showNext : steps[step].showNext,
+                        showPrevious: steps[step].showPrevious === undefined ? config.showPrevious : steps[step].showPrevious
                     };
                     //Don't mess around with angular sanitize for now. Add compile and sanitize later...
                     els.innerContent.html(steps[step].content);