Background Jobs + Status Polling fully functional

- Background jobs are being handled by sidekiq
- Created sidekiq-poller controller. Route returns status of job in JSON given :id
- AJAX polling to check status of job every x sec; redirect to address_set upon completion
- * see address_sets/create.js.erb
Working on Front-End progress bar for AddressSet creation
Progress feedback functional

- Current row/total rows progress being updated via ajax every x sec
Progress animations working
Adding beautiful design touches. Cherry on top time