Added airbrake notification for photo submission error that seems to affect Android clients.
Added epifamily as a supported taxon rank.
Some more to prevent big obs exports from clogging DJ.
Attempt to deal with encoding issues on photos/show.
Changed DJ priority for CSV generation.

These tend to clog up the queue, so they should always be entered at
something below the priority that photos get processed.
Using more path helpers; More preloading; Using has_attribute? for *_utc methods
Improved pagination patch; Removed preloading of project_users
Merge pull request #283 from pleary/paths

Path helpers, pagination, and other improvements
Changed obs near_point in the hope of better performance.