Update requirements.txt

Merge pull request #5 from iross/nov_fixes_and_updates

Add tesseract bbox visualization step

don't create unnecessary dirs; no need to cp orig (everything in input stays untouched

readme updates

use local dir for persistent pg data

make things work in python3 (filter is a generator, so this silently

make tmp dir for training images if it doesn't exist

Merge branch 'nov_fixes_and_updates' of https://github.com/iross/blackstack into nov_fixes_and_updates

use defaultdict -- fixes crash that happens if server is restarted before all labels have been seen in training

fix - move server start to a sensible place

Use input/

Use input/ and docs/ to manage input and output

run classification/extraction mode by default

Add rudimentary wrapper + envvar toggle