set ns time for write queue

when using the writer queue, the data will set the time(ns) instead of influxdb server time

retention policy

add createRetentionPolicy and dropRetentionPolicy

version 2.1.0

modify 'json' and 'csv' format type for support tags

improve query set function

improve reader set function, support RP start end limit slimit order offset soffset fill

support `format` and `epoch` setting for client

2.0.1

version 2.0.1

New version for influxdb 1.x

This version is for influxdb 1.x and it will be a stable version.

v1.0: Merge pull request #2 from vicanso/v1.x

V1.x