Fixes #14 Drops and recreates table when if it exists during initializing only if setClearZookeepers = true in configuration.

...g only if setClearZookeepers = true in configuration.

The more I thought about this, I think the best option is to drop and recreate the table when setClearZookeepers() is enabled and fail otherwise (with the table already exists exception).

I like this test, makes sure that a users data will not be dropped if they accidently init.  After the init call, could make a call to Accumulo to ensure table still exist.