Merge pull request #26 from seliopou/master

Refactor parser code, get tests to pass
Merge pull request #27 from seliopou/master

add travis config file
adding smoothing function and ploting of number of participants
Merge branch 'master' of github.com:sbenthall/bigbang
ascendancy, overhead, and capacity functions for adjacency matrices
moving parsing date from a message into bigbang.parse
remove some print statements
moving date parsing to parse; there's lots of gnarly edge cases
improving 'from' parsing
a method for turning an interaction graph into a matrix of edges with weight
compute ascendancy and capacity over time for a list. closes #30
add pytz to requirements.txt

Fixes tests.