Feature Request: Allow the pool to display "Worker Names"

[Valareos]

Sometimes, people have multiple machines mining to the same addresses. It would be great that the mining pool recognizes "Worker ID" information sent by miners, so a person can see which machines are providing what mining amount. It would make it easier to see if there is a problem with a specific machine.

[ipr0310]

This ticket is related to the following one: https://github.com/signum-network/signum-pool/issues/44