comment typo
Define `PluginHelper` interface and use that instead of *PipelineConfig as
argument type for Input.Start().
One line assignment if idiom is nice.
Rudimentary beginning of whisper time series file output.
Always use UTC time, and don't try to use a time.Time as an integer value in string
substitution.
First pass at full WhisperOutput implementation, one plugin managing all files in the
whisper db tree.
Fix some bugs flushed out by compiling, running, and first testing.
Set db intervals up correctly, further stubbing out of config setup, create folders when
necessary.
Some fixes to the statmetric format strings.
Move `err` declaration to function signature.
Scrap unnecessary `RunnerPlugin` pattern for FileOutput (i.e. no more FileWriter) and
integrate batch support directly into the output plugin. First step toward an abstracted
batch output pattern that can also be used by other outputs.
Use []byte for the batch buffers instead of *[]byte.
Forgot to actually start the output. Added the waitgroup support for good measure.
Whoops, zero is still an integer...
Merge branch 'features/fileoutput-reboot' into features/whisper-output

Conflicts:
	pipeline/outputs.go
Documentation clean-ups for proper godoc formatting.
Switch to whisper-go fork, close cleanly on stop event.
Need to add to the ref count to ensure our pack doesn't get zeroed before we're done.
Merge branch 'features/fileoutput-reboot' into features/whisper-output
Merge pull request #39 from mozilla-services/features/fileoutput-reboot

Features/fileoutput reboot