Refactor: Put services in own files
Refactor: Introduce 'stories' service

Start to put stories-related things into their
own service, as we start to clean up HomeCtrl.
Refactor: Move serverStories into stories service
Refactor: Introduce 'hacks' service

Hacks probably shouldn't exist, but it does, and
it contains things that don't belong anywhere
else.
Refactor: Move 'usefulStories' to stories service