Fixed gitignore

.gitignore

@@ -3,3 +3,20 @@ log/*.log
 tmp/**/*
 db/*.sqlite3
 coverage/*
+debug.log
+doc/rdoc
+activeresource/doc
+activerecord/doc
+actionpack/doc
+actionmailer/doc
+activesupport/doc
+activeresource/pkg
+activerecord/pkg
+actionpack/pkg
+actionmailer/pkg
+activesupport/pkg
+railties/pkg
+railties/test/500.html
+railties/doc/guides/html/images
+railties/doc/guides/html/stylesheets
+*.rbc