Minor spelling changes description of CCScene.h
Merge pull request #3736 from elwinarens/desc_scene_spelling

Minor spelling changes in description of CCScene.h[ci skip]
Update AUTHORS [ci skip]
retan ActionNode _actionSpawn while create
add judgment for retaining _actionSpawn
fixed action node crash
change to use CC_SAFE_RELEASE_NULL and CC_SAFE_RETAIN
Merge pull request #3755 from liamcindy/develop_action

[ci skip]change to use CC_SAFE_RELEASE_NULL and CC_SAFE_RETAIN
Prevent nullptr access in AssetsManager
Merge pull request #3550 from michaelcontento/fix-assetmanager-delegate-nullptr-access

Prevent nullptr access in AssetsManager
Update AUTHORS [ci skip]