Remove Parsoid-specific dependencies from logging lib.

* Removed location info, Util, env, pretty logtypes from logger.

* Added ParsoidLogger which inherits from Logger and adds
  Parsoid-specific functionality. Moved registration and
  configuration out of Util and env into this class.

  This class now provides the functionality that Logger
  provided previously.

  This pass still has the hack of injecting locationMsg fn.
  into LogData by monkey-patching its prototype.

Change-Id: Iad94cb7bbdc3341f3e7799845f1827dfd17d3848
Merge "Remove Parsoid-specific dependencies from logging lib."