Add modal dialog for viewing photos.

Needs styling work.  In particular, there are z-index issues causing the modal
to appear under the grayed out background, and the close button does not align
on the popup.
Add endpoint for map feature photo rotation.
Add JS code for rotating images.
Slight refactor of CartoCSS for map features
Fix production crash caused by a name longer than 30 chars

Maybe trailing blanks?
Style lightbox for photo carousel