Created DateTimeUtils utility class
Using DateTimeUtils to fetch current timestamp in Logger
Changed Logger constructor to pass LoggerConfig object as an argument
changed LoggerConfig to have parentLoggerConfig and publishers property
Added underscore as a dependency
enabled logging of stack traces in LogerConfig by default
Changed typescript compilation to generate single JS file rather than individual for all .ts files
Now also watching Gruntfile and grunt/* files to reload grunt build automatically
Changes in test configuration to take into account single JS file compilation
Added Manager class to get access to loggers and managing their relationships
Added getDefaultConfig method which will return root logger configuration for all other loggers
Added some tests for Manager