scm: add rev param to "View revisions" (#7984).
There are two paths to show specific revision.
* http://www.redmine.org/projects/redmine/repository/revisions/5219/show
* http://www.redmine.org/projects/redmine/repository/show?rev=5219
First link is http://www.redmine.org/projects/redmine/repository/revisions/5219/changes .
But, Second link is http://www.redmine.org/projects/redmine/repository/changes .
git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@5222
e93f8b46-1217-0410-a6f0-
8f06a7374b81