feat(incident): Add implementation of incident

- Add create/drop statements to create/drop incident table on h2
- Add FailedJobIncidentHandler which will be used to add (recursive) an incident in
  the incident table, if the property retries of a job is equals 0
- An incident will be deleted (recursive) along the incident hierarchy if
  the corresponding execution will be removed

related to CAM-798
feat(cockpit.filters): add shorten filter

- may be used to shorten a text {{ someText | shorten: 10 }} in
angularjs
feat(incident-test): Add some test case

- related to CAM-798
fix(handler): Fix interface of IncidentHandler

related to CAM-798
feat(rest): add modification/deletion of multiple execution variables

contributes to CAM-639
feat(rest): implement GET, PUT, DELETE for single variables

contributes to CAM-639
feat(rest): implement GET for all execution variables

contributes to CAM-639
chore(rest): add wink execution rest service tests
fix(cockpit.README): fix karma instructions

... to not download whole internet
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
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
feat(test): Add further testcase

related to CAM-798
Merge branch 'incident' of github.com:camunda/camunda-bpm-platform
feat(rest): add method for signalling message events for executions

contributes to CAM-635
fix(test): incident with timer start event
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
test(engine): assure file creation with createDiagramUponDeploy option

- just checks if an image file is created during deployment
- no qualitative evaluation of created image

contributes to CAM-766
fix(engine): fix createDiagramOnDeploy option

- fixes the image paths in ProcessDiagramCanvas

closes CAM-766