Merge pull request #22 from rfaulkner/working

Modifications to Job Queue backend
fix. live_account_query, refs to log_user rather than ept_user.  Remove join to page table.
mod. allow format_namespace to handle variable namespace columns.
mod. format_namespace, allow namespace to simply be an int.
mod. only apply substitution in sub_tokens for non-empty strings.
add. get_latest_user_activity to retrieve a users latest stamp to the rev table.
fix. Only apply -1 result to users that have not been alive for t minutes and not clicked the edit button.