Handle deleted documents correctly in -allDocsQuery:options:
Don't re-add deleted documents to the indexes

It'd fail anyway as the docs are blank, but we may as well avoid
the issue entirely.
Return new revision when deleting a document.
Fix doc for delete document method.
Fix testGetAllDocsDoesntFindDeletedDocs for new delete method signature
Don't build gem docs on travis
Responses to PR comments.
Merge pull request #19 from cloudant/28738-query-deleted-documetns

28738 query deleted documents