Added next and prev function.

README.md

@@ -34,7 +34,9 @@ $scope.onboardingSteps = [
     position: "right",
     description: "This is the form for configuring your account.",
     attachTo: "#account_form",
-    position: "bottom"
+    position: "bottom",
+    nextFunction: function nextClick () { alert('Next btn clicked') },
+    prevFunction: function prevClick () { alert('prev button clicked') }
   }
 ];
 ```

src/ng-onboarding.coffee

@@ -52,12 +52,18 @@ app.directive 'onboardingPopover', ['ngOnboardingDefaults', '$sce', '$timeout',
   link: (scope, element, attrs) ->
     # Important Variables
     curStep = null
-    attributesToClear = ['title', 'top', 'right', 'bottom', 'left', 'width', 'height', 'position']
+    attributesToClear = ['title', 'top', 'right', 'bottom', 'left', 'width', 'height', 'position', 'nextFunction', 'prevFunction']
     scope.stepCount = scope.steps.length
 
     # Button Actions
-    scope.next = -> scope.index = scope.index + 1
-    scope.previous = -> scope.index = scope.index - 1
+    scope.next = ->
+      if scope.steps[scope.index].nextFunction
+        scope.steps[scope.index].nextFunction();
+      scope.index = scope.index + 1
+    scope.previous = -> 
+      if scope.steps[scope.index].prevFunction
+        scope.steps[scope.index].prevFunction();
+      scope.index = scope.index - 1
     scope.close = ->
       scope.enabled = false
       setupOverlay(false)