allow negative array indexes in CPS
Remove dead files
Merge pull request #273 from graphicore/negative-indexes-in-cps-arrays

allow negative array indexes in CPS
Merge pull request #281 from rrthomas/master

Tidy up code and comments after restfs refactoring
Merge pull request #280 from rrthomas/dead-files

Remove dead files
Remove an unused import and make a console.log call consistent
Remove an unused import