Merge pull request #100 from PFA-OpenGL/async-load

Assets loaded from Assets Manager
Merge pull request #101 from PFA-OpenGL/entity-versionning

Entity versionning
Other demos fixed
Callback on local transform
Useless graphnode update calls removed
Merge pull request #103 from PFA-OpenGL/callback-on-transform

Callback on transform
test somme change
Merge branch 'master' into vertex-manager-clean-integration
correction of an error in constructor copy
vertexManager fix, error cause by stupid error of inattention, close #102