Adding cpu_stat and misc unix sysinfo, var, and vminfo.
Rewrite NIF using C version of kstat command line utility.
Adding some very basic tests and other code cleanup.
Clean up parts of the code and add a few sanity tests.
Updated README.md and adding CHANGES.md.
Version 0.2.0
Merge pull request #1 from potatosalad/master

Added support for timer, interrupt, and additional raw statistics