This Issue has been separated from KhronosGroup/glTF-Sample-Models#83 (comment)
I also tried Blender 2.78c and glTF 2.0 Explorter.
First I tried to display EmaSimpleSkin.dae on Blender.
Next, I tried to display the glTF 2.0 file exported from Blender in Babylon.js.
Babylon.js + EmaSimpleSkin.gltf result
I thought it was a problem with the exporter, but because it will be displayed in the Vulkan Renderer, there is a possibility of glTF 2.0 Loader problem in Babylon.js.