application controller refactor sidekick for traffic counter

Hey, i got interested in the project and wanted to give a contribution. this is a small refactor on the application controller with a addition of sidekiq to manage the increase traffic counter action.

by implementing it this way if by any means the block fails it will be rerun by sidekiq asynchronously. 
this need some more config done over on the prod server to run as intended would be pleased if the PR is accepted to help with this.

i think there are plenty other opportunities in the project for more workers.

i had to push the ruby version to 2 since sidekiq no longer supports 1.9 :S.