add pytz to requirements.txt

Fixes tests.
functionalizing out plotting code so that it's easier to do cross-list comparison
tweaks to the date parser so it doesn't fail on the odd Brazilian 2002 case
put dates on the activity charts
thicker interaction graph labels, and a fix to ref parsing
verbose mode when making graphs
more error handling on date parsing
condense plotting logic across mailing lists and improve ascendancy comparison
Update README.md

add a link to an alternative method for getting all the scipy packages
Merge branch 'master' of github.com:sbenthall/bigbang
Merge pull request #29 from seliopou/master

add pytz to requirements.txt, fix tests
Merge github.com:npdoty/bigbang into npdoty-configurable_extensions

Conflicts:
	bigbang/parse.py
	bin/plot_activity.py
Merge branch 'npdoty-configurable_extensions'
Merge branch 'master' of github.com:sbenthall/bigbang
Merge branch 'patch-1' of github.com:npdoty/bigbang into npdoty-patch-1
Merge branch 'npdoty-patch-1'
adding things to requirements.txt
adding Show Interaction Graph as an I Python example.
adding more dependency information. Note conda-requirements, which is a list of items ot be installed into a conda environment
combining list interactions into one with tograph.py