Define the LOG macro for release builds to keep some logging information
Enable the next pack after the last level of a pack is won and switch to it (fixes #4 and fixes #9)
Added jsex::load_root_from_file to help unify json loading (#16)
MapEditor: Added missing boost::date_time to the pch.h and added ../Log.cpp to the project
Added a Level struct that will take the place of LevelMetaInfo and the level loading in Game.cpp (#16)