Update/add source models (Avocado, BarramundiFish, BoomBox, Corset, and Lantern)

[bghgary]

#51

[emackey]

sourceModels/Lantern/T_LanternPole_mr.png looks odd to me. Is it a metal/rough map? There's not supposed to be an alpha channel in that map is there?

[bghgary]

That's a metallic smoothness texture intended for Unity3D which uses a sRGB grayscale metallic in RGB and a linear smoothness in A.

[emackey]

Oh, Unity, right. Thanks.

[lexaknyazev]

Please update glTF versions of Avocado and BarramundiFish in this PR. These models in master (ef49777) were produced by collada2gltf from now removed .daes.

[pjcozzi]

@bghgary please squash commits before merging to keep the repo size down.

[bghgary]

@pjcozzi will do.

[bghgary]

@lexaknyazev I've updated the models.

@pjcozzi I was thinking whoever does the merge will squash the changes using GitHub. Is that good enough or did you mean something else?

[pjcozzi]

@pjcozzi I was thinking whoever does the merge will squash the changes using GitHub. Is that good enough or did you mean something else?

Ah yes, I forgot about that feature!

@lexaknyazev please merge if you are happy with 2fb870b.