comment out intermittently failing HubNet tests

 see #207
update comment
upgrade to sbt 0.12.4
Merge remote-tracking branch 'origin/5.0.x'

Conflicts:
	test/commands/HubNet.txt
Merge remote-tracking branch 'origin/master' into core
Merge remote-tracking branch 'origin/core' into headless

Conflicts:
	headless/src/main/org/nlogo/parse/StructureParser.scala