Prep for 0.7.0 release.
Merge remote-tracking branch 'origin/dev' into dev
Clarify that cpu, disk, and mem stat decoders are Linux only, clarify
the message format expected by cpu, disk, and mem stat filters,
and lots of tweaks to get rid of Sphinx warning messages.
Use the new decoder file names in the tests.
Merge pull request #1049 from mozilla-services/doc-tweaks-linux-only

Doc tweaks linux only