A more efficient mongodb query; $or was executing multiple queries in
parallel. I've also added delay_until to the hash that gets inserted,
to further tidy the search query.
Add failed_status, pending_status & processing_status attributes rather
than directly modifying the object hash. Enables the status array to be
pre-generated rather than on the fly when get_options is called.
mention that delay_until queue key is now required
Merge pull request #4 from sonicblend/master

A more efficient mongodb query; $or was executing multiple queries in