Merge pull request #13 from mrecachinas/master

Fixed include error - #include <limits> -> #include <limits.h> or #inclu...
Updates to the 06-trees slide set
More work on 06-trees; only 1 or 2 slides left to convert
Merge pull request #14 from mrecachinas/master

Fixed more #include<limits> errors
Merge branch 'master' of github.com:aaronbloomfield/pdr
Finished the 06-trees lecture set
Updating the #include <climits> fixes that were sent in via pull requests
Updated the daily announcements for tomorrow's lecture
All the slide sets now properly validate as per validator.w3.org
Updates from today's lectures
A few updates to 06-trees.html
A few quick updates
Added lab 5, but needs a read-through and likely some edits
Added the makefile tutorial, but it also will need some edits and a full read-through
Updated the daily announcements for tomorrow (which is a snow day)
Added the expression trees steps in 06-trees
Upgraded to GraphViz 2.36, which caused the slides/graphs/*.svg images to change slighly
Added the svg versions of the red-black insertion diagrams, which are the same as in my wikipedia repo
Added the lab 5 AVL tree worksheet (including LaTeX source) to the repo
Final updates to lab 5