hadley/babynames — pull request #4 by ramnathv (2014-06-09 17:30:49+00:00)
Title: add lifetables data from SSA

I added the cohort `lifetables` from SSA. Let me know if you would like to include more detailed information on the variables in the dataset, or just point to this [link](http://www.ssa.gov/oact/NOTES/as120/LifeTables_Body.html) which has all the information.