Move customizations into puppet scripts

This allows students to customize their environments as they see fit;
even to the point of completely turning off our pretty prompt stuff and
all, should they desire.
Add the libjpeg-turbo package for 3.2
Actually manage the updates repo
Merge pull request #217 from binford2k/fix/3.2/libjpeg

Add the libjpeg-turbo package for 3.2

Thank you @binford2k
Merge pull request #216 from binford2k/wip/customizable_user_environment

Move customizations into puppet scripts