Add attachments to documents returned from activeRevisionsForDocumentId
Merge pull request #53 from cloudant/conflicted_documents_missing_attachments

Conflicted documents missing attachments
Change  attachmentsForRev:error:inTransaction: method signature to  attachmentsForRev:inTransaction:error:

Change  attachmentsForRev:error:inTransaction: method signature to  attachmentsForRev:inTransaction:error: and
correct cosmetic alignment issue, also remove value assign that is never used
Makes CDTAbstract/Pull/PushReplication conform to NSCopying.

This ensures that the replication configuration cannot change after
the instantiation of the CDTReplicator object, which could cause some
bugs.