Issue #5040: Improve ParticleSystem default initialization, no init function call if no parameter given
Merge pull request #1828 from pandamicro/develop

Issue #5040: Improve ParticleSystem default initialization, no init func...
Merge pull request #1830 from dingpinglv/Iss4975_SpineV3

Closed #4975: integrate spine into -html5 v3.0 beta
Fixed #4975: rename sp.Skeleton.createWithFile to sp.Skeleton.create