Fixes https://github.com/emberjs/guides/issues/1302
Fixes https://github.com/emberjs/guides/issues/1302

Guides version was hardcoded into the path.
I have added logic to fetch the latest version from the guides'
versions.json.

AaronSikes/website,zeppelin/emberjs-website,SaladFork/emberjs-website,SaladFork/emberjs-website,kpfefferle/website,AaronSikes/website,josemarluedke/ember-website,AaronSikes/website,kpfefferle/website,bmac/website,SaladFork/emberjs-website,workmanw/ember-website,kpfefferle/website,zeppelin/emberjs-website,SaladFork/emberjs-website,workmanw/ember-website,workmanw/ember-website,bmac/website,zeppelin/emberjs-website,josemarluedke/ember-website,zeppelin/emberjs-website,bmac/website,josemarluedke/ember-website,workmanw/ember-website,josemarluedke/ember-website,bmac/website