Merge pull request #1 from IljaGoushcha/rails_API

Rails API Server, has User, Image_Set, Image, Comment, Like, Tag models
added .env to gitignore
added .env file
added secret keys to .env
added aws-sdk gem
added config/initializers/aws.rb file that links to ENV
Merge pull request #2 from laurenfazah/rails_APOI

Added keys, .env, .gitignore
added tags route, added image_file to images migration
added aploader class