Bug 1259981

Title: Task Permissions Matrix

Describe the issue:
- As per the "Table 12.2. Main Operations Permissions Matrix" from our BPMS 6.1 Development Guide [1] the people like "Initiator,Stakeholder,Potential" can perform "release" operation on a Task. (i.e. all roles are marked as "+")

- As per the WS-HT 1.1 specification [2] this is what it says about who can perform "release".

~~~
4.10.2 Releasing a Human Task

The current actual owner of a human task can release a task to again make 
it available for all potential owners. A task can be released from active
states that have an actual owner (Reserved, InProgress), 
transitioning it into the Ready state
~~~
and
~~~
7.1.5 Operation Authorization

In the table in Page 91,

only Actual Owner is marks as "+".
Initiator and Administrator are marked as "MAY".
Potential Owner is marked as "n/a"
~~~

- our jBPM6 code allows only Owner and BusinessAdministrator to perform "release" operation.

./jbpm-6.2.0.Final-redhat-4/jbpm-human-task/jbpm-human-task-core/src/main/resources/operations-dsl.mvel
~~~
...
    Operation.Release
        : [ new OperationCommand().{
                status = [ Status.Reserved, Status.InProgress ],
                allowed = [Allowed.Owner, Allowed.BusinessAdministrator ],
                setNewOwnerToNull = true,
                newStatus = Status.Ready
            } ],
...
~~~

[1] https://access.redhat.com/documentation/en-US/Red_Hat_JBoss_BPM_Suite/6.1/html/Development_Guide/sect-Task_Permissions.html#Task_Permissions_Matrix
[2] http://docs.oasis-open.org/bpel4people/ws-humantask-1.1-spec-cs-01.pdf

Suggestions for improvement:
- Please check it from respective SME and correct the statement in our document.

Additional information: