Use slug as 'id' in Project serializer.
Fix project tests.
Make website links work properly in wallposts and reactions.
Make links in wallposts and reactions open in new window.

BB-136 #resolve
Merge pull request #220 from onepercentclub/fix-project-relationship-problem

Use slug as 'id' in Project serializer.
Use render template tag instead of overriding renderTemplate in route.
Merge pull request #221 from onepercentclub/wallpost-roast-1

Wallpost roast 1
Revert "Use render template tag instead of overriding renderTemplate in route."

This reverts commit 049284e73c4a9e9cda9e9e6bd092fc179314e4a8.
Merge branch 'master' into ember-multiple-transactions