Update bootstrapp-sass to 3.1.1.0

CHANGELOG FOR 3.1.1.0
 - Updated Bower docs
Update sidekiq to 2.17.5

CHANGELOG FOR 2.17.5

 - Automatically use the config file found at config/sidekiq.yml, if not
   passed -C. [#1481]
 - Store 'retried_at' and 'failed_at' timestamps as Floats, not Strings.
   [#1473]
 - A USR2 signal will now reopen all logs, using IO#reopen. Thus,
   instead of creating a new Logger object, Sidekiq will now just update
   the existing Logger's file descriptor [#1163].
 - Remove pidfile when shutting down if started with -P [#1470]