Modern Physics created, and a few other adjustments

There is an issue with the floating stuff in the course main pages.

height:auto
height:auto,float:left;
height:auto,float:left;
The first height:auto div isn't height:auto'ing.

I created the Adaptive Learning page really quickly. It doesn't look
good, but I got the text plastered on there.

Figured out exactly how text lesson includes will work. When someone
generates a lesson, it tacks on "include certain file" before, in the
middle, and after the text they input. So I now can adjust everything
about the display of a lesson and the changes go through to every lesson
that includes those files I change.

Now I just need to figure out the feedback capabilities, and how to
create my 222 files.