Correct incorrect 2PI calc. Closes #648
resolve undefined bug on iPad 1. Closes #646 and #425
misc fixes to segmentset. Closes #610
Merge branch 'dev'
optimisation to the MD2 parser. Closes #631
fix to rotate yaw pitch roll for scaled 3D objects. Closes #626
bugfix on filter method for custom filterFunc. Closes #619
fix for picking when null material encountered
updating of MAX_SIZE const for textures to 4096. Closes #647
Merge branch 'dev'
fix to awd1 parser
refix to pitch/roll/yaw
updated changelog and bumped revision number to 4.1.5
Merge branch 'master' into dev

Conflicts:
	src/away3d/core/base/Object3D.as