exporting JBIG2 images

[side2k]

I found out that pdfminer stumbles on PDF files with embedded images encoded by JBIG2 codec. This code allows to export that images to jbig2 files, which could be converted in another formats, for example, by jbig2dec tool.

[pudo]

@side2k have you considered adding this PR for https://github.com/goulu/pdfminer ?

[side2k]

@pudo @hason already suggested it more than 3 months ago as you can see above, but no answer from repo owner. I just tried to make PR, but now it has some conflicts, too much time has passed. I'll look into it in a nearest few days, thanks for noticing.

[goulu]

Hi @side2k . @euske doesn't seem to be very active on his original pdfminer but we're a small group working on the "pdfminer.six" fork which uses six for Py2/Py3 compatibility.
I see you're member of the group, you're most welcome to resubmit the PR there. Thanks !

[side2k]

@goulu thanks for invitation. Currently I'm a bit overloaded with work, but I'll try to check out your project a bit later and help, if I can 8)