* SSE: fix reduce to handle non-null
* add type for data.Field that is float64 or *float64
* resample fix for non-null input case, add couple non-null tests
This is a translation of services/alerting/conditions. Main Changes:
- Work with types in SSE (series/number) which are data frames (no more null.Float).
- The query part from alerting/conditions is handled by SSE logic
- Convey / simplejson removed.
- Time range no longer part of "query" in the condition
Kyle Brandt