Fix file-path for dummy FileTask for static files

lib/task/task.js

@@ -142,16 +142,21 @@ TaskBase = new (function () {
 
       // Task doesn't exist, may be a static file
       if (!prereq) {
-        filePath = name.split(':')[1] || name;
+        // May be namespaced
+        filePath = name.split(':').pop();
+        filePath = utils.file.absolutize(filePath);
         // Create a dummy FileTask if file actually exists
         if (existsSync(filePath)) {
-          stats = fs.statSync(filePath);
-          prereq = new jake.FileTask(name);
-          prereq.modTime = stats.mtime;
-          prereq.dummy = true;
-          // Put this dummy Task in the global Tasks list so
-          // modTime will be eval'd correctly
-          jake.Task[parsed.name] = prereq;
+          // and there's not already an existing dummy FileTask for it
+          if (!jake.Task[filePath]) {
+            stats = fs.statSync(filePath);
+            prereq = new jake.FileTask(filePath);
+            prereq.modTime = stats.mtime;
+            prereq.dummy = true;
+            // Put this dummy Task in the global Tasks list so
+            // modTime will be eval'd correctly
+            jake.Task[filePath] = prereq;
+          }
         }
         // Otherwise it's not a valid task
         else {