Fix rake:revision_file.
Fix rake:revision_file.

macressler/haml,haml/haml,stanhu/haml,sideci-sample/sideci-sample-haml,keithpitty/haml,tangposmarvin/haml,keithpitty/haml,amatsuda/haml,stanhu/haml,nazar-pc/haml,nazar-pc/haml,haml/haml,uniba/hamldoc_ja,haml/haml,haml/haml,dg1dd1ngs/haml,dg1dd1ngs/haml,concord-consortium/haml,tangposmarvin/haml,macressler/haml