std.experimental.logger formal review round 3

[Dicebot via Digitalmars-d]

On Monday, 10 November 2014 at 18:32:03 UTC, Robert burner 
Schadek wrote:
> On Monday, 10 November 2014 at 17:03:31 UTC, Dicebot wrote:
>> There are also some more @safe changes need, I hope to provide 
>> another branch with those soon enough (~tomorrow)
>
> thank you

https://github.com/Dicebot/phobos/tree/logger-safety

I think that should be it for now