replace deprecated Version#completed_pourcent at lib/redmine/helpers/gantt.rb (#12724)

git-svn-id: http://svn.redmine.org/redmine/trunk@12439 e93f8b46-1217-0410-a6f0-8f06a7374b81
add stderr to config.active_support.deprecation in test and dev env

git-svn-id: http://svn.redmine.org/redmine/trunk@12440 e93f8b46-1217-0410-a6f0-8f06a7374b81