Undo partial changes if something fails
Undo partial changes if something fails

Changes file helper to use relative paths, so that they play nice with
`git diff`.

activeadmin/activeadmin,javierjulio/activeadmin,vraravam/activeadmin,deivid-rodriguez/activeadmin,javierjulio/activeadmin,activeadmin/activeadmin,javierjulio/activeadmin,deivid-rodriguez/activeadmin,vraravam/activeadmin,activeadmin/activeadmin,vraravam/activeadmin,deivid-rodriguez/activeadmin