Remove README.md file created by github
Remove doxygen setup

We'll use markdown for our documentation needs.
add gtest sources

To use gtest, I guess you're supposed to build this every time you
build your own project.  It seems kinda weird, but apparently the
compiler options must be the same or you could potentially run
into problems.

Do they #if parts of structures or something?  Oh well...
Build and link against gtest for unit tests
Add a temporary automated test while bringing up gtest framework
Add a markdown description of using paddlewheel
gtest: run cmake and commit the generated makefile

Yeah, this sucks.  I tried some tricks to get cmake running automatically
when the toplevel configure or make runs, but it never worked completely
correctly.

Maybe we can improve this in the future so we don't have to commit
the generated makefile...