add rake clean task

Jan Lehnardt · Jan Lehnardt · commit 8d7238f9fc8d · 2009-10-20T20:21:24.000+02:00
diff --git a/Rakefile b/Rakefile
@@ -27,3 +27,6 @@ task :jquery do
   print "Done, see ./#{target_jq}\n"
 end
 
+task :clean do
+  `for file in \`cat .gitignore\`; do rm -rf $file; done`
+end
