Fixes bugs related to sample rate and centerPos in triggerGrains.
Grain duration is now modulatable by triggerGrains.
Switches to a Hann window for enveloping grains.
Makes delayDur and grainDur modulatable in flock.ugen.granulator.
Adds support for user-specifiable grain envelopes.
Minor naming and performance improvements.
Minor performance tweak to ugen.granulator.
Merge branch 'granular-improvements'

* granular-improvements:
  Minor performance tweak to ugen.granulator.
  Minor naming and performance improvements.
  Makes delayDur and grainDur modulatable in flock.ugen.granulator. Adds support for user-specifiable grain envelopes.
  Grain duration is now modulatable by triggerGrains. Switches to a Hann window for enveloping grains.
  Fixes bugs related to sample rate and centerPos in triggerGrains.