Allows withoutFetch() in DomainBucket

This is a simple change allowing a boolean to be set when
constructing a DomainBucket that is then used to call
withoutFetch() on the underlying StoreObject

Addresses #232
Merge pull request #234 from basho/gh233-add-without-fetch-to-domainbucket

Allows withoutFetch() in DomainBucket