Initial AsyncHBase support (rebased)
SCHEMA-789. Implement KijiTableWriter Interface w/ AsyncHBase
Updated necessary fiels as requested in pullrequest.
Added a wrapAndRethrow in the AsyncKijiTable constructor. Changed 'scanner' to 'Scanner' in a comment in AsyncKijiTableWriter.
SCHEMA-790. Implement BufferedKijiTableWriter Interface w/ AsyncHBase

Implement a BufferedKijiTableWriter interface using AsyncHBase instead of HTable.
Rewrote AsyncKijiBufferedWriter to use AsyncHBase's internal time-based buffer.
Updated AsyncKijiTableWriter and AsyncKiji as necessary to work with that change.
Cleaned up some formatting, declared method arguments 'final', and updated some deprecated methods.