Update InfluxDBHandler for post InfluxDB 0.9
Update InfluxDBHandler for post InfluxDB 0.9

* Fix for ticket #297 where InfluxDBHandler was formatting metrics based
  on an older version of influxdb-python
* Maintains support for InfluxDB version 0.8 by way of an additional
  'influxdb_version' attribute in the config.
* Reformats measurement schema to be more useful for InfluxDB 0.9's removal
  of merge and joins.
* Add timeout option.
* Adds several test cases for the handler.

Ssawa/Diamond,Ssawa/Diamond,Ssawa/Diamond,Ssawa/Diamond