use webjars-locator

and eliminate webjars.sbt for now. some form of it might come back
later as part of support for V8-based testing and/or browser-based
testing

for gory details, see discussion on HipChat today
Merge pull request #84 from NetLogo/sortable-lists

Sortable lists
State Machine Example crosses finish line

plus get newer version of Sandpile from models repo that
uses fewer workarounds (since tasks work now)
update model dumps
speed up TestModels by diminishing problem sizes

smaller worlds, shorter runs
Merge pull request #83 from NetLogo/webjars-locator

replace webjars.sbt with webjars-locator
Recategorizing failing language test
Reordering many of the freebie language tests
Recategorizing failing language test
Revert "use webjars-locator"

This reverts commit 9659ff372067c273ec884729ac289c927ab5940e.
Creating a handy, dandy 'jsengine' package
Introducing Benchmarker 1.0
Adding version number of JS engine to benchmark

It just makes sense to include version numbers of external libraries
into the benchmarks, since changing version numbers can change speed.
Minor package-pushing (refactoring)
Pumping up the private sector
Adding SpiderMonkey support