Update .gitignore (added *.bbl *.blg)
draft figure for evolution of forum/talk arch.
added comment below introduction

possibility of emergence is crucial to a social machine. would
zooniverse be a social machine without the forum and/or talk?
another comment on two paths to science

consider adding the third 'hidden' path of offline communication
 a few tidyings
master merge

Merge branch 'master' of github.com:sociam/zooniverse-history
merging master comments in

Merge branch 'master' into themes