improve(rest test): extend expected exception responses

contributes to CAM-730
fix(select-dataType): Fix datatype selection

- fix datatype selection in tasklist
- by changing the data type the process will not be started anymore

related to CAM-702
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
improve(javadoc): PA classes
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
feat(rest): improve exception mapping

- adds RestExceptionHandler that translates exceptions explicitly
thrown in the REST API to responses with specific error codes
and a json message body that includes the exceptions type
and a detailed message

contributes to CAM-731
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
fix(tasklist): fix group task counts

closes CAM-741
improve(rest): rephrase exception messages for queries

CAM-694
fix(rest): improve resteasy test runtime performance

- exchanges twjs server by netty
- greatly improves test runtime

closes CAM-431
chore(rest): cache loggers
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
feat(rest): add DELETE process instance

contributes to CAM-641
fix(ci): exclude jboss only in gf CI
Merge branch 'master' of github.com:camunda/camunda-bpm-platform
fix(CI): temporary disabling testcase
Merge remote-tracking branch 'upstream/master' into rest-api-additions

Conflicts:
	engine-rest/src/main/java/org/camunda/bpm/engine/rest/impl/ProcessInstanceRestServiceImpl.java