Reorganizing some freebie tests
Whoops
Fixing language test/random number truncation
Merge pull request #87 from NetLogo/fix-random-numbers

Fixing language test/random number truncation
Recategorizing last language test I half-care about

Conflicts:
	src/test/scala/TortoiseFixture.scala
Updating 'headless' dep. version
Fixing string representation of agentsets
Correcting the breed and kind returned by `turtles-on` (fixes #88)

The most obvious implication of the old behavior was that the result of
`turtles-on` would throw an exception when converted to a string
upgrade to sbt 0.13.2
Merge remote-tracking branch 'origin/master' into sbt-0.13.2