fixed a bug that occured when you tried to add friends
updated achievements and fixed add friend bugg
added the give achievement route that will later be used to give a user a achievement
fixed a bug with routes
fixed basic achievement page
restyled achievements
added find-challenge page
updated api
added hosts option
fixed a cross browser bugg
added host
Merge branch 'devel-0.2' into create-challenge-0.2
fixing hosts
public -> isPublic
Fixed some things