Imagebuilder: Add switch to select bin output dir
|Reported by:||freifunk at somakoma de||Owned by:||developers|
I would appreciate if you could apply the attached patch to the imagebuilder sources. It allows users to select the output directory for generated images (default is ./bin) by using BIN_DIR=<dir> in the "make image" command. This is something i need for my web-imagebuilder  and probably it would be useful for other usecases, too.