Stable improvements and bugfixes release

Features:

• #6 Added description field to the metrics. It is collected only from Infracheck and shows the detailed failure/success information
• #4 Add possibility to customize the metrics name (default is "riothealthflux")

Bugfixes:

• #5 Correctly handle 5xx errors returned by Infracheck
• #3 Batch push data into InfluxDB to avoid gaps on the charts in Grafana (because the data was submitted not as one push and had different ids and timing)