Merge remote-tracking branch 'origin'
Merge branch 'consolidate-columns-1'

Conflicts:
	bigbang/process.py
module for crawling/scraping for w3c web archives of mailing lists
add another common file extension for mbox archives
parses and saves mbox archives for w3c mailing lists
detect w3c list archives and use dedicated crawl/collect function in that case
resolve small edit conflict
unzip step is unnecessary for w3c lists, but should just be a no-op, so this bin change was unnecessary
Python's builtin mailbox parser can do this more efficiently, I think
apply appropriate unicode transformations to every string
Merge branch 'mailbox-1' into w3crawl
refactor to better handle missing fields
unicode everything; separate ipynb for additional sender stuff
initial code and examples for analyzing affiliation distribution through email domain names
better error handling
calculate mbox path ahead of time, so as not to repeatedly download the same archives
reorder instructions to have collect mail first, explicitly install Graphviz, closes #12
adding coverage module to conda requirements relates to #36
adding coverage to pip requirements relates to #36
removing cruft