Add InfluxDB support

docs/INFLUXDB_INTEGRATION.md

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+### InfluxDB integration
+
+You could install InfluxDB from [binary packages](https://influxdb.com/download/index.html)
+
+For Debian 8 Jessie I could offer part of manual here:
+```bash
+wget https://s3.amazonaws.com/influxdb/influxdb_0.9.2_amd64.deb
+sudo dpkg -i influxdb_0.9.2_amd64.deb 
+```
+
+Then we should enable graphite protocol emulation in configuration file: /etc/opt/influxdb/influxdb.conf:
+```bash
+[[graphite]]
+  enabled = true
+  bind-address = ":2003"
+  protocol = "tcp"
+  consistency-level = "one"
+  name-separator = "." 
+```
+
+And disable Graphite daemons if you use they before:
+```bash
+systemctl stop carbon-cache
+```
+
+And start InfluxDB:
+```bash
+systemctl restart influxdb
+```
+
+You will got web frontend on 8083 port and query API interface on 8086.
+
+Then we need fix some parts of /etc/fastnetmon.conf configuration file:
+```bash
+graphite = on
+graphite_host = 127.0.0.1
+graphite_port = 2003
+graphite_prefix = fastnetmon
+```
+
+And apply changes to configuration file:
+```bash
+systemctl restart fastnetmon
+```
+
+Finally you could query data from InfluxDB with CLI tool /opt/influxdb/influx:
+```bash
+select MEAN(value) from "fastnetmon.outgoing.pps"
+name: fastnetmon.outgoing.pps
+-----------------------------
+time            mean
+1970-01-01T00:00:00Z    334968.38950276235
+```