We use .keep files (closes #159)

Author: David Heinemeier Hansson

README.md

@@ -47,7 +47,7 @@ Some CSS packages use new CSS features that are not supported by the default Sas
 
 ### Why do I get `application.css not in asset pipeline` in production?
 
-A common issue is that your repository does not contain the output directory used by the build commands. You must have `app/assets/builds` available. Add the directory with a `.gitkeep` file, and you'll ensure it's available in production.
+A common issue is that your repository does not contain the output directory used by the build commands. You must have `app/assets/builds` available. Add the directory with a `.keep` file, and you'll ensure it's available in production.
 
 ### How do I avoid `ActionView::Template::Error: Error: Function rgb is missing argument $green`?