Feature Request: Option to organize in folders under Models

[b3nd1k]

For 3D prints with a lot of different parts, it would be great if I could organize the different parts under the "Moldels" section in folders.

Take this Pixelbox print for exaple, it is already organized in folders.

[EduardoOliveira]

This will be followed in Maker-Management-Platform/docs#30