Added project code, data, files, etc.

I have uploaded a **bunch** of stuff used to prepare the APSA paper over the last year or so. I also did some housecleaning. Now the LaTeX code resides in papers/ subdir, for example. 
The paper here is essentially the same we sent to APSA 2014, with minor edits by Alejandro (to test github) and myself. I will next start working on the Bias in Mexico smaller paper that has been hinted/discussed in our recent exchanges. 
Good day to all,
-e