Log Message:
Import ruby215-redmine-2.6.0 as devel/redmine.

Redmine is a flexible project management web application. Written
using the Ruby on Rails framework, it is cross-platform and
cross-database.

Redmine is open source and released under the terms of the GNU
General Public License v2 (GPL).

Features

Some of the main features of Redmine are:

   Multiple projects support
   Flexible role based access control
   Flexible issue tracking system
   Gantt chart and calendar
   News, documents & files management
   Feeds & email notifications
   Per project wiki
   Per project forums
   Time tracking
   Custom fields for issues, time-entries, projects and users
   SCM integration (SVN, CVS, Git, Mercurial, Bazaar and Darcs)
   Issue creation via email
   Multiple LDAP authentication support
   User self-registration support
   Multilanguage support
   Multiple databases support

This package contains all required Ruby gems in it.
Th code in Makefile should be moved to lang/ruby/*.mk later.