Influx: Configurable measurement name

[Admiraldr]

Currently the measurement name seems to be hardcoded to "measurement" (not the best choice, since this is a keyword in the Influx CLI). A Parameter to define the measurement name would be great.

Also: it seems not to be mentioned in the doc that the measurement name is "measurement". I initially was looking for something like "cbpi" (as the MQTT Topic).

Same request can applied to the MQTT root topic for CBPi.

[avollkopf]

Influxdb topic should be working with this version

MQTT topics should be fix as there are too many dependencies. It has been documented here