feat(cockpit.filters): add shorten filter

- may be used to shorten a text {{ someText | shorten: 10 }} in
angularjs
feat(cockpit webapp): update paginator + tests
feat(cockpit webapp): update process instance page

update error handling on process definition not found

update instance view
- instances with failed jobs are properly displayed
- use paginator

Closes CAM-705
Merge branch 'master' of github.com:camunda/camunda-bpm-platform