remove unneeded instance variable assignment from ProjectNestedSetTest

git-svn-id: http://svn.redmine.org/redmine@13430 e93f8b46-1217-0410-a6f0-8f06a7374b81
Gemfile: update Rails version to 4.1.6

git-svn-id: http://svn.redmine.org/redmine@13431 e93f8b46-1217-0410-a6f0-8f06a7374b81
MailHandler: Don't use String#respond_to?(:force_encoding) (#18047)

Contributed by Felix Schäfer.

git-svn-id: http://svn.redmine.org/redmine@13432 e93f8b46-1217-0410-a6f0-8f06a7374b81
Fixed redirect error with Rails 4.1.6.

git-svn-id: http://svn.redmine.org/redmine@13433 e93f8b46-1217-0410-a6f0-8f06a7374b81
Moved assertion to get more information about the failure.

git-svn-id: http://svn.redmine.org/redmine@13434 e93f8b46-1217-0410-a6f0-8f06a7374b81
Don't change setting for other tests.

git-svn-id: http://svn.redmine.org/redmine@13435 e93f8b46-1217-0410-a6f0-8f06a7374b81