Set starting ID to 0 and fixed next/prev arrow positions
Merge branch '7.x-2.x' of github.com:phase2/oa_sitemap into 7.x-2.x

* '7.x-2.x' of github.com:phase2/oa_sitemap:
  Add list of subspaces to json data
  Add arrows to old sitemap
  Tweaking older sitemap for demo