Add-on Walker adapter

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[>>>] Generating Attributions log:

[0] Thing Title : Windup Walkers
[0] Thing URL : http://www.thingiverse.com/thing:13915
[0] Thing Author : MakerBot
[0] Thing Licence : Creative Commons - Attribution

[1] Thing Title : AF-100-4x3x4
[1] Thing URL : http://www.thingiverse.com/thing:22902
[1] Thing Author : ChrisMagno
[1] Thing Licence : Creative Commons - Attribution

[2] Thing Title : Sierpinski Triangles and Carpets
[2]