Removed issues,mr delete buttons. Refactored models

app/controllers/merge_requests_controller.rb

app/models/key.rb

app/models/key_observer.rb

app/models/project.rb

app/models/project_observer.rb

app/views/issues/_form.html.haml

app/views/issues/_show.html.haml

app/views/merge_requests/_form.html.haml

app/views/projects/index.html.haml

config/application.rb

db/schema.rb

spec/models/project_spec.rb

spec/requests/issues_spec.rb