Hadupils::Extensions initial stuff

Base:
* A base class for representing points in the filesystem
  containing assets to make available to hadoop/hive/etc.
* Uses the Hadupils::Assets functions to navigate directories.
* Provides an interface for expressing hiverc files to accompany
  the stuff.

HiveRC:
* Provides classes to wrap/manage hive initialization files
* Static class with minimal functionality to wrap extant init files
* Dynamic class for assembling temporary init files based on
  input assets and arbitrary initialization file commands.