remove unneeded Relation#all from WorkflowsController#edit

git-svn-id: http://svn.redmine.org/redmine/trunk@12999 e93f8b46-1217-0410-a6f0-8f06a7374b81
remove unneeded Relation#all from Issue#workflow_rule_by_attribute

git-svn-id: http://svn.redmine.org/redmine/trunk@13000 e93f8b46-1217-0410-a6f0-8f06a7374b81
Gemfile: pin rake version 10.1

rake 10.2.0 requires Ruby version >= 1.9.

git-svn-id: http://svn.redmine.org/redmine/trunk@13001 e93f8b46-1217-0410-a6f0-8f06a7374b81
add ChangeLog note that #15781 was forgotten to merge to v2.4.3.

git-svn-id: http://svn.redmine.org/redmine/trunk@13004 e93f8b46-1217-0410-a6f0-8f06a7374b81