Created directory structure and initial import of source code

Added /bin, /data, /data/tests, /gnuplot, /include, /lib, and /src directories.
This layout will likely change as the project progresses.

I've also added several source, header, atom, and gnuplot command files. These
were compile-able on Windows 7 and Mac OS X prior to being added to these
directories. I will need to update some of the code in order to make them
work correctly again.
Added initial version of .gitignore file