Merge branch 'feature/1376-allow-write-access-deploy-keys' into 'master'

app/assets/stylesheets/pages/deploy_keys.scss

app/controllers/admin/deploy_keys_controller.rb

app/controllers/projects/deploy_keys_controller.rb

app/helpers/projects_helper.rb

app/models/deploy_key.rb

app/models/key.rb

app/views/admin/deploy_keys/index.html.haml

app/views/admin/deploy_keys/new.html.haml

app/views/projects/deploy_keys/_deploy_key.html.haml

app/views/projects/deploy_keys/_form.html.haml

...nreleased/feature-1376-allow-write-access-deploy-keys.yml

db/migrate/20160811172945_add_can_push_to_keys.rb

db/schema.rb

doc/api/deploy_keys.md

features/admin/deploy_keys.feature

features/steps/admin/deploy_keys.rb

lib/api/entities.rb

lib/gitlab/auth/result.rb

lib/gitlab/checks/change_access.rb

lib/gitlab/git_access.rb