Partial move to new transformer library.
Use new pipeline testing functions.
Add filter pipeline
Merge branch 'master' of https://github.com/sburnett/bismark-passive-server-go

Conflicts:
	passive/availability.go
	passive/bytesperdevice.go
	passive/bytesperdevice_test.go
	passive/bytesperminute.go
	passive/bytesperminute_test.go
	passive/index.go
	passive/indexer/main.go
	passive/passive_test.go
	passive/pipelines.go
	passive/pipelines/main.go
	passive/transformer.go
	passive/transformers.go