parallel benchmarks.
Rename parallelism -> parallel.

--HG--
rename : scenarios/parallelism/async.js => scenarios/parallel/async.js
rename : scenarios/parallelism/callbacks.js => scenarios/parallel/callbacks.js
rename : scenarios/parallelism/co.js => scenarios/parallel/co.js
rename : scenarios/parallelism/deferred.js => scenarios/parallel/deferred.js
rename : scenarios/parallelism/index.js => scenarios/parallel/index.js
rename : scenarios/parallelism/pinky-sync.js => scenarios/parallel/pinky-sync.js
rename : scenarios/parallelism/pinky.js => scenarios/parallel/pinky.js
rename : scenarios/parallelism/promises.js => scenarios/parallel/promises.js
rename : scenarios/parallelism/q.js => scenarios/parallel/q.js
rename : scenarios/parallelism/when.js => scenarios/parallel/when.js
Fixes running instructions.