Non-generic logger name for better filtering

[robhruska]

Fixes #32.

The ILog used by Command is just a single logger for all possible Commands, which makes any log filtering to hide/show logs for specific commands difficult.

This changes the log name to incorporate the command's name into it.

Old

2014-11-30 00:00:49,075 hostname [INFO ] [Hudl.Mjolnir.Command.Command`1] InvokeAsync Command=group-name.CommandName Breaker=breaker-name Pool=pool-name Timeout=15000

New

2014-11-30 00:00:49,075 hostname [INFO ] [Hudl.Mjolnir.Command.group-name.CommandName] InvokeAsync Command=group-name.CommandName Breaker=breaker-name Pool=pool-name Timeout=15000