Change linear regression file to 'regression'
Release version 0.3.2

A housekeeping release, mostly:
* Adds the 'http://' prefix back to URLs so that they work in more pdf
  readers
* Updates the README file with more useful directions on compiling
  pdfs
* Adds placeholder files for version and citation information to
  prevent compilation errors
* Changes to include the author list and license in each pdf by
  default
* Renames the linear regression file