Ascii javadoc

Added sketches which are more concisely than simple images.
Furthermore, this introduces new javadoc tags, such as: stage.output, stage.input and stage.sketch

See merge request !57

corrected link

Report unconnected ports

fixes #218
Unconnected ports are now reported

See merge request !53

myBeTriggered in AbstractStage.onSignal

See merge request !52

Active declaration

fixes #174
renamed addThreadableStage to declareActive and added a flag to Stage indicating if the current stage is active or not

See merge request !54

Conflicts:
	src/main/java/teetime/framework/A3PipeInstantiation.java

added logging to A3PipeInstantiation

typo