Dont publish tmpdir file in NPM package

Created by: erulabs

Hello!

I love the project - and have been working to cut back on the size of some of my more popularly used NPM modules! I've noticed bull has a tmp directory in the published version of bull version 1.0.0. It contains:

ls -al node_modules/bull/tmp
-rw-r--r--   1 erulabs  users    13M 19 Jun 06:35 AMS.rar
-rw-r--r--   1 erulabs  users   3.2K 20 Jun 06:09 test.js

I'm not sure what AMS.rar is (seems to contain an AMS_clean.hdf file which encoded in a way I'm not familiar with).

Anyways, I scouted the codebase a bit and I get the feeling this was just a publishing mistake!

After removing tmp/, the bull module works fine and weighs just 256K :)

Thanks!!!