fix logging in unit tests
add an autoflush parameter to session to allow autoflush behavior
use RowDeletingIterator
Upgrade to Accumulo 1.5.0
Swap empty strings for empty byte arrays
addMutation to writer for delete
Merge pull request #6 from altamiracorp/faster-delete

Faster delete
faster deletes. Closes Issue #3 and Pull request #5
merge from master