Ticket #2632 [nine] Use plurals in REST paths
 - upgrade master to use plurals
   buildbot.test buildslave.test pass
 - migrate buildbot-www to use plurals
Ticket #2662 `grunt prod` no longer works..
 - Force to use angular-ui-router 0.2.7
 - angular-ui-router 0.2.8 (which was released yesterday) breaks the build.
Merge branch '9/trac2662' of git://github.com/delanne/buildbot into nine
Merge branch '9/Use_plurals_in_REST_Paths' of git://github.com/delanne/buildbot into nine

+autopep8