Add share button to /mybadges page that shows share modal.
Because badge thumbnails were turned into an include, internal
blocks can't be overridden where we were doing it before,
so there's some extra redirection to get around that.
Hook up Mozilla Backpack button to do modaless push
Don't show share button if underage
fix grid
Commenting out additional share buttons until they're implemented
dropdown consistency
Basic badge sharing and privacy control
Add where clause to shareToken.find()s
Fix minor issues:
  share toggle endpoint is post instead of get now
  removed unused model relationship
  basic (like... really basic) LESS styles
more ui (menu)
Fix incorrect LESS -> CSS compilation of previous commit
Merge pull request #608 from mgballard/master

fix grid
Merge pull request #596 from stenington/589-badge-sharing

Basic badge sharing and privacy control
Merge pull request #602 from stenington/592-backpack-push

Push to backpack