Extra metrics sent to librato

[mikehale]

With a new drain and sending measure= source= I'm seeing min, max, etc. I only expected to have .count since I did not specify val=.

[ryandotsmith]

@mikehale will this continue to be a problem even in light of #50 ?

[mikehale]

Actually I think think this request was around an old log convention (counters vs lists). Based on the readme I was expecting a single metric to be produced, but it appears that l2met has changed in behavior here so this issue does not apply anymore.