Adding a Mention model, test stubs

.gitignore

.rspec

Gemfile

Gemfile.lock

app/models/mention.rb

app/models/status.rb

app/services/post_status_service.rb

app/services/process_feed_service.rb

app/services/process_mentions_service.rb

db/migrate/20160224223247_create_mentions.rb

db/schema.rb

spec/controllers/atom_controller_spec.rb

spec/controllers/home_controller_spec.rb

spec/controllers/profile_controller_spec.rb

spec/controllers/xrd_controller_spec.rb

spec/helpers/routing_helper.rb

spec/models/account_spec.rb

spec/models/favourite_spec.rb

spec/models/follow_spec.rb

spec/models/mention_spec.rb