Rewrite paths to tufte-latex files
Set shell in makefile to bash

Setting the shell used by the makefile to bash makes `echo -e` work,
which generates the correct bibtex record for the project.
Add dependency directions to README

This commit adds information about the texlive packages (in Ubuntu) that
are necessary to compile the pdfs.  It would be great to add directions
for Mac and Windows, but those will have to come in the future.
Make minor edits in README