[Nepal] redmine 0.7.3

[Bernie Innocenti]

I noticed redmine 0.7.3 is out, with many fixes (some of which security
related).

Shall we update our instance?

-- 
   \___/  Bernie Innocenti - http://www.codewiz.org/
  _| X |  Sugar Labs Team  - http://www.sugarlabs.org/
  \|_O_|  "It's an education project, not a laptop project!"