bump cli

[finishes #102114438]

Submodule src/github.com/codegangsta/cli 9b2bd2b..96f1fed:
  > Merge pull request concourse#281 from thiderman/patch-1
  > Merge pull request concourse#267 from tristanz/master
  > Merge pull request concourse#279 from nodirt/version
  > Merge pull request concourse#280 from gummiboll/fix-for-testcommandignoreflags
  > Merge pull request concourse#275 from langri-sha/master
  > Merge pull request concourse#274 from klueska/bash-completion-default-prog
  > Merge pull request concourse#264 from wardn/master
  > Merge pull request concourse#246 from cpuguy83/propigate_cmd_parent_to_app_setup
  > Merge pull request concourse#251 from MartyMacGyver/more-cleanups
  > Merge pull request concourse#253 from databus23/fix-isssue-252
  > Merge pull request concourse#245 from cpuguy83/get_parent_ctx
  > Merge pull request concourse#238 from polds/copyright
  > Merge pull request concourse#244 from wallclockbuilder/patch-1
  > Merge pull request concourse#241 from codegangsta/travis-update
  > Merge pull request concourse#232 from codegangsta/fix-231
  > Merge pull request concourse#233 from codegangsta/add-flag-docs
  > Merge pull request concourse#230 from codegangsta/do-not-swallow-after-error
  > Merge pull request concourse#227 from databus23/global-flags-from-all-parents
  > Merge pull request concourse#229 from saromanov/fix-missing-value
  > Add instructions for distributing bash completion
  > Set additional information on command's 'app'
  > Merge pull request concourse#218 from codegangsta/add-another-help-test
  > Rename TestShowAppHelp to be more verbose
  > Add test for inclusion of 'AUTHORS' in App help
  > do not print 'AUTHOR(S):' is there is no author
  > Merge pull request concourse#217 from codegangsta/readd-print-help-function
  > Merge pull request concourse#211 from netbun/patch-1

Signed-off-by: Corbin Halliwill <challiwill@pivotal.io>