display quest creation timestamp; move like+watch buttons

also:
- less color in reward circle
- get rid of quest/watch model, since watch button is separate from
  watchers badge
- don't display "Take" button if not logged in
Merge branch 'quest-creation-timestamp'

http://questhub.io/meta/quest/519291671088c76505000073
rebuild static
remove quest-watch.html from www-build