Better Bulk Importer

Added a more powerful bulk importer.  Some features:

* Easier to use.  Picks up configuration in honeycomb.xml so you don't need to specify as much boilerplate.  Better CLI commands, and more usage feedback.
* Optionally intelligently splits HBase table.  Splits at the beginning of the data section and each index section.
* Automatically loads hfiles.  Intelligent about cleaning up after itself and saving useful intermediate hfiles in case of load failure.

This is going to make #163 a lot easier to fix as well.