Fix a sneaky bug in handlebars helpers

 is destructive.
Update version of Shareabouts.js dependency
Add a button for requesting a new snapshot to the shareabouts settings
Merge branch 'staging' into shareabouts-download-link
Only request a new snapshot if we haven't yet.
Clean up

- Move download button markup into a template
- Move filename parsing into a handlebars helper
HOTFIX: full-width image section, reusable styles/classes
Merge branch 'staging' of github.com:openplans/planbox into shareabouts-download-link
style data download link/message/button
HOTFIX: format event title/date, make event title an input (not content editable), bugfix not all event/attachment fields triggering save button
HOTFIX: add z-index to #page, preventing anything from overlapping the topbar
Merge pull request #97 from openplans/shareabouts-download-link

Shareabouts download link
HOTFIX: add .text-center to image section for images smaller than container
HOTFIX: nix .drag-area opacity (caused trouble w/ nested dropdowns)
Merge branch 'staging' of github.com:openplans/planbox into teams
Update css