support influxdb version 1.4#41

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sioomy wants to merge 7 commits intobernd:masterfrom

Commits on Dec 20, 2017

support influxdb version 1.4
wangxiuming
committed
optimize matrics type
wangxiuming
committed

Commits on May 11, 2018

feat(logResponse): add more useful log method for http responses that prints out headers (that have influxdb errors)
joeycumines
committed
fix(influxdb-sets): avoid attempting to send more than one data type (e.g. unique strings) as it will fail / not work properly
joeycumines
committed

Commits on May 12, 2018