improvment task query using candidateAndAssignee
Javadoc for TaskQuery#taskCandidateOrAssigned.
Rest documents for execution query.
Fixing history tests for different history levels
Add parameter candidateGroups to runtime/tasks + document for task query parameter candidateAndAssignee
rename candidateGroupses to candidateGroups
Merged pull request 325
Merge pull request #324 from henryyan/rest-execution

Rest documents for execution query.
Merge branch 'task-query-rest' of https://github.com/henryyan/Activiti
property name changed
Small doc change
Document for method taskCandidateOrAssigned in TaskQuery
JOB_CANCELED
PROCESS_COMPLETED event
TASK_TIMEOUT
Added db2 database mapping after reading forum post
Commit patch for ACT-2052
Applied patch ACT-2023
Applied patch ACT-2038
Applied patch ACT-2055