Fix for cocoalumberjack 2.0b

Opening this up for discussion: 

This updates for CocoaLumberjack 2.0.0-beta4 release. Since its a pre-release I'll update this accordingly when i notice a new release has happened. 

Most of the changes are just with accessing variables and dealing with renames.

This should (probably) not be merged until v2.0.0 of CocoaLumberjack is officially released also.