Omniauth-facebook back to 1.4.0

modified:   Gemfile
Merge branch 'master' of https://github.com/QutBioacousticsResearchGroup/bioacoustic-workbench
Added auth check skipping to /experiment#create.
removed some changes in routes that were trying to fix /security#ping errors.

modified:   Gemfile.lock
modified:   app/controllers/experiments_controller.rb
modified:   config/routes.rb