This submission includes the following changes:
 - CSS tweaks for the legend and map toggle buttons in phone display mode
 - CSS tweaks to ensure fixed height for upload form that scrolls when overflowing
 - Add checkboxes for acceptance of terms and agreement to share uploaded photos under CC-SA. The actual terms and conditions is verbatim copy from the current WKT site and is shown in a bootstrap modal. The submit button in the upload form is disabled until both checkboxes are checked.
 - Refactor the photo selection so that both selection of photo markers or clicking on a photo thumbnail brings up the same photo modal dialog.
Escape any quotes in photo descriptions so we don't trip up alt text on flickr thumbnails.