minor changes.
first steps for poc implementation of 'REST tasks'.
also: reformatted code files.
necessary classes added for 'REST publish task'.
execution behavior adds 'user task' to the engine when encountering
custom 'REST publish tasks'.
changed database (to activiti2).
Merge branch 'poc' of https://github.com/thensgens/activiti into poc

Conflicts:
	TODO.txt
	modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/ServiceTaskJavaDelegateActivityBehavior.java
	modules/activiti-engine/src/main/java/org/activiti/engine/impl/bpmn/behavior/UserTaskActivityBehavior.java