Application URL - http://tww-wfnnjxms.rhcloud.com/
Background Process - http://tww-wfnnjxms.rhcloud.com/sidekiq

Twitter API calls are made in background (using sidekiq) and scheduled after every 4 hours (using sidetiq)
The results are cached in redis

Screenshots
http://imgur.com/pE0jRM1
http://imgur.com/1GQ64nY

Running Tests
Testing is done on live data as their are only 9 person and redis is very fast
redis-server
./bin/rake twitter:users:load
./bin/rspec spec/

Starting the application in development mode
redis-server
./bin/rake twitter:users:load
./bin/sidekiq -c 1 -t 10
./bin/rails s