feat(cancel): Cancel process instance

- In cockpit it is possible to cancel a running process instance.
- Add modal dialog to camunda-common package.
- remove expected request body for delete request

related to CAM-781
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
feat(engine-rest) Added job resource and query

feat(engine-rest) Added execute to Job Resource
Merge branch 'master' of github.com:camunda/camunda-bpm-platform

Conflicts:
	webapps/cockpit/cockpit-webapp/src/main/webapp/app/cockpit/directives/breadcrumbs.js
	webapps/cockpit/cockpit-webapp/src/main/webapp/app/cockpit/pages/process-instance.html
	webapps/cockpit/cockpit-webapp/src/main/webapp/app/cockpit/pages/processInstance.js
	webapps/cockpit/cockpit-webapp/src/main/webapp/assets/css/common.css
feat(toolbar): Add toolbar to cockpit

related to CAM-781,782