added Casper.options.onStepComplete() callback

@@ -49,6 +49,7 @@
             onError:            null,
             onLoadError:        null,
             onPageInitialized:  null,
+            onStepComplete:     null,
             onStepTimeout:      null,
             onTimeout:          null,
             page:               null,
@@ -612,6 +613,7 @@
         runStep: function(step) {
             var skipLog = isType(step.options, "object") && step.options.skipLog === true;
             var stepInfo = "Step " + (this.step + 1) + "/" + this.steps.length;
+            var stepResult;
             if (!skipLog) {
                 this.log(stepInfo + ' ' + this.getCurrentUrl() + ' (HTTP ' + this.currentHTTPStatus + ')', "info");
             }
@@ -630,7 +632,7 @@
                 }, this.options.stepTimeout, this, new Date().getTime(), this.step);
             }
             try {
-                step(this);
+                stepResult = step(this);
             } catch (e) {
                 if (this.options.faultTolerant) {
                     this.log("Step error: " + e, "error");
@@ -638,6 +640,9 @@
                     throw e;
                 }
             }
+            if (isType(this.options.onStepComplete, "function")) {
+                this.options.onStepComplete(this, stepResult);
+            }
             if (!skipLog) {
                 this.log(stepInfo + ": done in " + (new Date().getTime() - this.startTime) + "ms.", "info");
             }

@@ -213,6 +213,15 @@ casper.thenOpen('tests/site/global.html', function(self) {
     self.test.assertEquals(self.getGlobal('myGlobal'), 'awesome string', 'global retrieved')
 });
 
+// Casper.options.onStepComplete
+casper.then(function(self) {
+    self.options.onStepComplete = function(self, stepResult) {
+        self.test.assertEquals(stepResult, 'ok', 'Casper.options.onStepComplete() is called on step complete');
+        self.options.onStepComplete = null;
+    };
+    return 'ok';
+});
+
 // History
 casper
     .thenOpen('tests/site/page1.html')