Update sidekiw 2.17.7 -> 3.0.0

I looked through the upgrade guide and it looks like this will be a
clean upgrade for us.

  https://github.com/mperham/sidekiq/blob/master/3.0-Upgrade.md

A post on the changes in this version can be found at:

  http://www.mikeperham.com/2014/03/28/sidekiq-3-0/

Change-Id: Ic0e13f5edd9f10055421b268cef009d44b294480
Update rake 10.1.1 -> 10.2.2

Change-Id: I7afbfe9a913284222919530fa42963a8ec82adb2