allow generating in same folder as psd (no filename-assets subfolder)

[simonhermann]

Make it possible generate assets outside of the subfolder (called filename-assets).
E. g. by adding "no-subfolder" to the layer name.

[jessewallace]

This has been asked for so many times; why hasn't it been integrated yet?

[corinedwards]

It's such a shame that an automation feature requires manually moving the files around at some point anyway.