make extension builds follow new bintray redirects
convert nearly all of Instruction to Scala

leaving in Java for now: public fields we access in tight inner loops
Merge pull request #586 from NetLogo/scalify-instruction

convert nearly all of Instruction to Scala
reformatting in ExpressionParser

trying to bring the level of hair-raising-ness down from 11
to say 10.8 or so
reformat TestLabels.scala
shorten some irritatingly long test names
rename a misnamed source file
remove redundant 'test' from test names
Adding some tests agentset counting/stringifying in certain cases
Merge remote-tracking branch 'origin/headless' into scala-2.11