Doc updates
Update diskusage to calculate like iostat
Keep python 2.4 compatibility
Merge pull request #270 from disqus/iostat-parity

Update diskusage to calculate like iostat
Fix up unit tests for disk usage collector to be correct now
PEP8
Fixes #271, this fixes the import namespace collision issue after moving to the official librato library
fixed scoping issues in LibratoHandler
Merge pull request #272 from briceburg/master

fix scoping in LibratoHandler