Merge branch 'metrics-deployment-history' into 'master'

app/assets/javascripts/monitoring/constants.js

app/assets/javascripts/monitoring/deployments.js

app/assets/javascripts/monitoring/prometheus_graph.js

app/assets/stylesheets/pages/environments.scss

app/controllers/projects/deployments_controller.rb

app/serializers/deployment_entity.rb

app/serializers/deployment_serializer.rb

app/views/projects/environments/metrics.html.haml

config/routes/project.rb

...ate/20170327091750_add_created_at_index_to_deployments.rb

db/schema.rb

spec/controllers/projects/deployments_controller_spec.rb

spec/features/security/project/internal_access_spec.rb

spec/features/security/project/private_access_spec.rb

spec/features/security/project/public_access_spec.rb

spec/fixtures/api/schemas/deployments.json

spec/javascripts/fixtures/environments.rb

spec/javascripts/fixtures/environments/metrics.html.haml

spec/javascripts/monitoring/deployments_spec.js

spec/javascripts/monitoring/prometheus_graph_spec.js