Add an .rvmrc file.
Add libxslt-dev to packages - required to build nokogiri
specify lockfile for two jobs that didn't have one
Update rack to protect against 2013-02-08 - Timing attack against Rack::Session::Cookie.
Merge branch 'master' of ssh://git.mysociety.org/data/git/public/fixmytransport
Upgrade to Rails 2.3.18 to get fixes for CVE-2013-1855, CVE-2013-1856, CVE-2013-1857.
Merge branch 'master' into mark-dev