Add disk IO statistics.
Merge pull request #7 from rdwilliamson/master

Add disk IO statistics.
Add /proc/vmstat support

This adds support for parsing /proc/vmstat contents.

Signed-off-by: Pekka Enberg <penberg@iki.fi>
Merge pull request #9 from dream0411/master

fix bug: out of index and 32bit cpu number
Merge pull request #8 from penberg/vmstat

Add /proc/vmstat support
Add licensing information

Fixes #4.
Merge pull request #10 from penberg/license

Add licensing information