make it clear what those are for when using InfluxDB
Allow filtering values in metrics before display

This lets you report things like disk space in MB (you're monitoring
both boot and root, they both report in MB) but you want to display
some things in GB.

Can include a filter function in the metric to divide by 1024, and
now your MB are in GB.
Rename filter to transform, include README bit
Always provide base when using parseInt
Note that transform is optional, add example to InfluxDB section
Merge pull request #75 from darkhelmet/transform

Transform function on metrics