Merge pull request usablica#517 from labithiotis/master

Added callback for onskip event (clicking skip inside tooltip container)

Author: bozdoz

intro.js

@@ -1259,6 +1259,12 @@
           self._introCompleteCallback.call(self);
         }
 
+
+        if (self._introItems.length - 1 != self._currentStep && typeof (self._introExitCallback) === 'function') {
+          self._introExitCallback.call(self);
+        }
+
+        self._introSkipCallback.call(self);
         _exitIntro.call(self, self._targetElement);
       };
 
@@ -2465,6 +2471,14 @@
       }
       return this;
     },
+    onskip: function(providedCallback) {
+      if (typeof (providedCallback) === 'function') {
+        this._introSkipCallback = providedCallback;
+      } else {
+        throw new Error('Provided callback for onskip was not a function.');
+      }
+      return this;
+    },
     onbeforeexit: function(providedCallback) {
       if (typeof (providedCallback) === 'function') {
         this._introBeforeExitCallback = providedCallback;