Update sidekiq gem 2.17.6 -> 2.17.7

- Auto-prune jobs older than one hour from the Workers page [#1508]
- Add Sidekiq::Workers#prune which can perform the auto-pruning.
- Fix issue where a job could be lost when an exception occurs updating
  Redis stats before the job executes [#1511]

Change-Id: Ia582a1e06e0f29c5b50d34eb6dc89b28e8c55e7b
Update aws-sdk gem 1.34.1 -> 1.35.0

Change-Id: I4c933df586e29ce207e7c78cdecf4995c85eea84
Update factory_girl_rails gem 4.4.0 -> 4.4.1

Also included are this gem's dependencies, thread_safe and atomic.

Change-Id: I5c07c09c0b53bde63da92fc5bdaf4bce68e36cd9
Update rspec-core 2.14.7 -> 2.14.8

Change-Id: I72e6180fac1deff3e9d2685730e58947e5c1f367