use latest models
Publish changes from TreeAgentSet to allow nw ext to update graph context
add a (passing) resize-world test

noticed while going over some code with Nicolas that we didn't have
test coverage on whether breed agentsets got cleared when the world
resizes
add comment to some unused code in ArrayAgentSet
missing piece of sbt 0.12.4 upgrade
Revert "Publish changes from TreeAgentSet to allow nw ext to update graph context"

This reverts commit 523b89018fa16101dcce924e5afdf7a93e03f09f.

Will turn into a pull request instead.
Merge remote-tracking branch 'origin/5.0.x'

Conflicts:
	src/main/org/nlogo/agent/ArrayAgentSet.java