Add a docs page

This is where the first documentation will go.
Refactor: Put stories in their own directive

Prepare for using live stories in our documentation
by moving the story template into its own file
and making a story controller.
Refactor: Put story list in its own directive
StoryList: Isolate scope

Isolate the scope of the story list so
that we can use it with an arbitrary
list of stories and owners in the docs.
Refactor: Move story list func into StoryListCtrl

Move code related to the story list directive out
of HomeCtrl and into StoryListCtrl.
Docs: Wire up new story-list
StoryList: Add a facade mode for docs

Now we have a story list that moves things
around but does not necessarily save them
to the server.
StoryList: Move 'storyNotify' from HomeCtrl

Move the 'storyNotify' handler into the
StoryList directive, while honoring the
isFacade flag.
Docs: Add a basic tutorial
Docs: Set navbar item as active when on page

Set the top-navbar's "Documentation" list item
as active when we're on the docs page.