get a recent couchdb package into debian testing/wheezy-backports

1.4 was removed from testing:

• http://packages.qa.debian.org/c/couchdb.html
• http://packages.qa.debian.org/c/couchdb/news/20140214T163910Z.html
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=735501

(from redmine: created on 2014-04-09, closed on 2014-10-06, relates #6187)