Use inheritable class attributes in Query model.
Removed conditions on HTTP methods.
Use \A and \z in validation regexps.
Cleanup dependencies in Project model.
Moved user status constants to Principal model.
Specifies HTTP methods for all routes.
Fixed that issues grouped by custom field is broken in PDF export (#12513).
Don't use jruby-openssl with JRuby 1.7.0 (#12228).
MailHandler: exit with 75 when a SystemCallError is raised (#12528).
