Bump Sidekiq and other related gems
Bump Sidekiq and other related gems

* Sidekiq changes:
  https://github.com/mperham/sidekiq/blob/master/Changes.md

* Rack 1.6.1 fixes CVE-2014-9490:
  https://github.com/rack/rack/blob/master/CHANGELOG.md

* rack-protection 2.0.4 only fixes a minor message:
  https://github.com/sinatra/sinatra/commits/master/rack-protection

mmkassem/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,iiet/iiet-git,axilleas/gitlabhq,iiet/iiet-git,iiet/iiet-git,stoplightio/gitlabhq,dreampet/gitlab,stoplightio/gitlabhq,stoplightio/gitlabhq,mmkassem/gitlabhq,iiet/iiet-git,mmkassem/gitlabhq,axilleas/gitlabhq,dreampet/gitlab,dreampet/gitlab,axilleas/gitlabhq,mmkassem/gitlabhq,axilleas/gitlabhq