Utilize logging Markers when using SLF4J logger

[GoogleCodeExporter]

It would be very nice if you could add Markers for the events you are 
outputting. E.g. timing values, SQL data etc. 

Now everything goes into the message which makes it less usefull if you have a 
logging stack like ELK and wishes to do filtering etc. against defined logging 
markers.

Original issue reported on code.google.com by e...@knowit.no on 4 Feb 2015 at 6:52

[slavik57]

Look at pr #92 maybe you can use that