Move achievements into the user app

Achievements seem to fit better in the user app.
Achievements are shown on the user profile.
The achievements page will only be show the logged in users achievements

What was left in the app related to quizess so it is now the quiz app.

The AchievementDefinition model was also dropped in favor of a static list
Show achievements on the user profile page
Fix image and font copying in gulpfile.js
PR fixup: use integers for achievement IDs, fixup user page
PR fixup: fix tests
Merge pull request #109 from maurizi/show-achievements

Show achievements on the user profile page