Support for basic BPMN2 elements

[adamfowleruk]

User Task (Basic HTML step processor)
Task (subclasses only for MarkLogic actions, not generic support)
Send task (SOAP)
Send task (REST)
Loop characteristic (on individual activities)
Exclusive gateway
Error event (route to specific CPF task as per BPMN2 spec)

[adamfowleruk]

Exclusive gateway and 'Task' (pass through) activities added

[adamfowleruk]

startEvent and endEvent added

[adamfowleruk]

Descoped HTML processor. Done REST API for one though.
Task pass through complete
send task (SOAP and REST) descoped til 006
send task (email) added to this sprint
loop descoped until 002
error event descoped until 004

[adamfowleruk]

Currently testing final (Email SMTP) task

[adamfowleruk]

Verified fixed in tests 21-23