added 'smoothing' property
fixed maximum capacity to actual stage3d limits
fixed calculation of 'emitRadiusDelta' (changed in PD2, looks more correct; closes #20)
Fixed particle system 'texture' setter as it requires vertex data readjustment.
Merge pull request #23 from Rokannon/master

Fix in particle system 'texture' setter
added parsing of 'minRadiusVariance'

Thus, better compatibility with PD preview.
See https://github.com/71squared/ParticleEmitterDemo-GLKit-ARC/commit/c58f6350f2f2bb295c9f03f7b3df8a89e3f64688
removed FDT complaining about dead code
Merge pull request #24 from alamboley/master

removed FDT complaining about dead code
added fallback value for 'minRadiusVariance' (closes #26)