Initial MessageProcessStep
process framework documentation
First parts of the refactoring (ProcessStep + Messages)
refactored Process:
- removed setFirstStep() -> only setNextStep() used now
Small changes.
First error free (part core) refactoring result (combining messages with
process steps)
adapted documentation
encapsulated rollback process, can only be triggered over stop()
minor refactorings and documentation
BaseMessageTest is working now
Merge branch 'login-2'
Fixed failing messages tests.
Merge branch 'file-manager'
Completed the TestSuite
tests
Small bug fix
Stub for base direct message process step test
Merge branch 'messageProcessStep'

Conflicts:
	org.hive2hive.core.test/src/org/hive2hive/core/test/process/ProcessStepTest.java
Fix NPE
Make ProcessManager stable for concurrency