Explained some of what currently takes place within lambda-free.fun

Specifically, I commented on the newScope function with a summary of its purpose,
and on the Fun branch of the exp function with an explanation of individual steps.
Merge branch 'master' of https://github.com/DanRosenwasser/mlton
Fix 'Log' and 'Edit' link URLs.
Use more verbose attribute entities.
Generate HTML5 footer information based on 'git log' information.
Condition generation of git attribute entity flags on presence of git.
Simplify SVG for MLton logo.

Unfortunately, ImageMagick and GraphicsMagick don't properly support
"use" elements.  The intention of defining the various strokes is for
reuse and experimenting with effects.
Merge pull request #25 from MatthewFluet/asciidoc-guide

Additional commits for AsciiDoc guide.
Merge pull request #8 from DanRosenwasser/master

Commented lambda-free.fun

The code in lambda-free.fun utilizes mutability somewhat heavily, and uses fairly clever ways of accomplishing tasks in few steps. Unfortunately this makes it difficult to understand at a first glance. This minor changeset should provide some basic idea on how to approach/maintain the code contained in lambda-free.fun in the future.
Merge branch 'master' of https://github.com/MLton/mlton into pre-201306-release