threadableStages list

Nested compositestages

finished the new method which works with nested composite stages.
Tested with kieker-teetime-stages (already adapted) and kieker-trace-diagnosis (after adaption).

See merge request !42

Pipe instantiation

everything seems to work fine... the only thing left are the rawtypes to which I have no idea for a solution.
However, !40 should be merged first.

See merge request !41

Conflicts:
	src/changes/changes.xml
	src/main/java/teetime/framework/Analysis.java

Init signal final

#154
Introduced semaphores in RunnableProducerStage which let it wait for Initializing- and StartingSignal.
The analysis starts all threads instantly in init() and sends an InitializingSignal.
All producer wait until they all get triggered.

See merge request !40