add include path for the base dir of current file

Author: stevenschobert

lib/index.js

@@ -18,11 +18,12 @@
             includes = this.includePaths || [],
             outputStyle = this.outputStyle || 'compressed',
             imagePath = this.imagePath || '/',
-            outputDir = this.outputDir || path.dirname(filename);
+            outputDir = this.outputDir || path.dirname(filename),
+            fileDir = path.dirname(path.join(basePath, filename));
 
         if (isSassFile(filename) === true) {
           // Append the file's base path to the available include paths.
-          includes.push(basePath);
+          includes.push(fileDir);
 
           // Compile the file using SASS.
           sass.render({