Renamed EngineLog to Logger
Travis: only build master branch
Renamed EngineMath to MathFunctions
Renamed EngineException to Exception
Updated README
Removed Configuration class and decoupled logger from constructors
Merge branch 'master' into v4refactoring
Added specific information about the next release
Merge README from master
Merge branch 'master' into v4refactoring
Scene and PlayerView classes removed.
Model separated from model loading logic.
Updated README