Extracted configurations about google api to .env and added foreman and unicorn gem
deleted categories instead added platforms and technologies.
added /upload_prediction_data request, it builds prediction_data.csv and upload it to the google cloud storage.
added shell script to automate uploading csv data.
refactoring :  removed opening CSV class from uploads_controller, instead added HashableCSV class inheriting CSV.
typo
added rake task 'feed_data'
rename
updates welcome page
(Category => Platform, Technology) : updates sinatra app
updates key file
added pg gem
Merge branch 'cs-2657-auto-feed'
updates mongoid.yml
Merge branch 'cs-2657-auto-feed'
removed sqlite3, instead mongodb is used.
Merge branch 'cs-2657-auto-feed'
update gemfile