When releasing/tagging Pillar

[Ducasse]

We should not forget to freeze microdown or we should not depend on the microdownDev baseline.

BaselineOfPillarApp

         ...
	"Microdown - we want it in App."
	spec baseline: 'MicrodownDev' with: [ 
		   "spec className: 'MicrodownDev'."
			spec repository: 'github://pillar-markup/Microdown:dev/src' ].

[Ducasse]

Or we should have a BaselineOfPillarAppDev and a BaselineOfPillarApp