renamed mixins and fixed error

library/less/mixins.less → library/less/_mixins.less

@@ -62,8 +62,8 @@ http://0to255.com/
 @bones-pink:        #f01d4f;
 @bones-blue:        #1990db;
 
-@link-color:        $bones-pink;
-@link-hover:        darken($link-color, 9%);
+@link-color:        @bones-pink;
+@link-hover:        darken(@link-color, 9%);
 
 /*
 Here's a great tutorial on how to