Merge pull request #149 from calonso-conabio/master

translations
Numerous minor fixes.
Added tags to guide xml response.
Widget requests should ignore mobile user agent.
Removed tag summary data from guide xml response.
Fixed some issues with messages from deleted users.
Sundry bug fixes.
Fixed dumb project bug and some minor other stuff.
Minor guides stuff.
Switched to a different repo for the preferences gem.
Ensured that temporary processing images for LocalPhotos have absolutel urls.
More guides stuff, stubbed out some ngz url and file size methods.
NGZ creation must be explicitly enabled by guide authors.
Minor guides stuff.
Added geoprivacy filter to observations.
Bugdix: obs project filter wasn't working when handed a project record.
Added simple projects tab to places/show.
First step toward obs export tool.
Added project and user fields to export UI.
Filtered out private coordinates where appropriate.