Custom logger#6

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HEYGUL wants to merge 4 commits intoandysmart:masterfrom

octo-technology:master

Commits on Mar 8, 2016

[Custom logger] Add a closure to get the ability to perform logging through a custom logger (like CocoaLumberJack for example)
Guillaume Lagorce
committed
Merge branch 'feature/cocoalumberjack_integration'
Guillaume Lagorce
committed

Commits on Mar 17, 2016

Add filtered mode
Stéphane Prohaszka
committed

Commits on Mar 18, 2016

Add some fix and update README
Stéphane Prohaszka
committed