Freetext description for Graphs

[arkhipenko]

Would be really nice if in the plugin configuration I can give a freetext name to the respective graph to replace 'coretemp-isa-0000/temperature-temp1' with 'Main CPU: Core 1 Temperature'

[httpdss]

there is something i would have to solve before someone gets on this issue, and that is data persistance. feel free to comment about this at http://github.com/httpdss/collectd-web/issues#issue/18