Changing pc.Curve and added pc.CurveSet, WIP integrating particle system components with the Designer
Some curve fixes
Removed snow particle example because it is now under particle_system/simple
Added clone method to curves
WIP particle system integration - added 'wrap' boolean to particle system and other fixes
Curves are now stored as objects in the db to account for smoothstep
Curves now have a type instead of smoothstep field
Set min max values for 'div' graphs
CurveSet constructor now only supports numbers and arrays of arrays
Changed texture to colorMap, textureAsset to colorMapAsset, normalTexture to normalMap and normalTextureAsset to normalMapAsset
Merge pull request #57 from playcanvas/feature/particlesystem-integration

Feature/particlesystem integration