Use official python bindings in Librato's handler.
Don't run userscript test if kitchen isn't avail

This mimics other tests where part of the resources aren't available.
Merge pull request #267 from drio/master

Use official python bindings in Librato's handler.
Test for kitchen only when necessary
Merge pull request #266 from j2sol/master

Don't run userscript test if kitchen isn't avail
Doc updates
Fixes #265, only verify that there is a path in the device path rather then starting with a /. This fixes collecting nfs mount space
Fix python 2.4 support for librato
PEP8
Stop silently failing when the ping binary is not found or is not executable
Fix silently bailing if /proc/loadavg is not found