update contributors

Add all known contributors to date.
Merge branch 'master' into jarvis
Created maze image.
redid spacing in markov chains lab.
remove dependency on biblatex
Merge pull request #112 from ayr0/removedep

remove dependency on biblatex
Lab: KNN and SVM
formatted source code per pep8
various formatting changes

Also break lines for easier reading.
Merge pull request #113 from ayr0/KNNSVM

Lab: KNN and SVM
Merge branch 'master' into jarvis
add Tyler Jarvis as co-author to textbook

Also added nociteref option to document class.
paralist is now a dependency to build.
Merge pull request #93 from ayr0/jarvis

add Tyler Jarvis as an author
Added the problem with the maze to the markov chains lab. Also fixed some
typos and the references in that lab.
Added adjacency matrix file and the .py file to generate it to the Markov
chains 1 lab.
Added notebook with markov lab solutions.
Added .py solutions to markov lab and made some formatting changes in the
notebook version.
Thickened lines in maze graphic in markov lab.
Merge pull request #108 from insertinterestingnamehere/markov

Markov
Merge branch 'master' into typofixes