Fixed issue with HTML showing on taxon tree browser; some preloading for mobile workflows
PicasaPhoto.repair wasn't catching the right HTTP exceptions.
Added abilit to specify legacy auth settings.

This was written to accomodate integration of NatureWatch, but it
could be used or modified if the need arises to change our own auth
info.
Added site_id to obs api.
HERE ENDETH AMATEUR HOUR.
Minor translation.
Merge pull request #296 from pleary/small_fixes

Fixed issue with HTML showing on taxon tree browser; 
some preloading for mobile workflows
Fixed bug in eventbrite URL parsing.
Odds and ends from nz integration.
Improved error message when creating an obs field that already exists.
Filter /guides by site place (#305)
Merge branch 'pleary-assets'
Merge branch 'master' of github.com:inaturalist/inaturalist