Bucket now only takes a directory in the constructor.
Bucket now only takes a directory in the constructor.

The bucket started out as consisting of an index,
name and format. But after developing with TDD it
turned out that a bucket is a directory.
Very nice refactoring and all the tests still work.
splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl