feat(instance): Add link to process instance

- It is possible to click on one process instance in the process
  definition view to show the process instance.
- the process instance view contains the process diagram
- furthermore, the process diagram directive is now clean and there exists
  a activity statistics directive (former both were one directive).
- add a filter to shorten the number (1000 to 1k etc.)
- add some test cases

related to CAM-716
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
fix(mappings): Fix mappings in xml
Merge branch 'master' of github.com:camunda/camunda-bpm-platform