Display milliseconds in the graph (InfluxDB)

Hi! I fixed a bug. Now the chart displays the millisecond. I had to edit files "influxdbDatasource.js" and "timeSeries.js". You were almost right when you suggested solution - https://github.com/grafana/grafana/issues/714. You have to be careful, as the corrected file "timeSeries.js" may affect the performance of other databases (Graphite and OpenTSDB).