Adding additional comments

Adding additional comments so that folks know to use the integration tool rather than copying this for better results.

Grails.gitignore

@@ -1,4 +1,7 @@
 # .gitignore for Grails 1.2 and 1.3
+# Although this should work for most versions of grails, it is
+# suggested that you use the "grails integrate-with --git" command
+# to generate your .gitignore file.
 
 # web application files
 /web-app/WEB-INF/classes