add GistDetail view; refactor RootController#root to bootstrap current_user and gists
refactor GistsIndex to render GistDetail
add (nonfunctional) favorite button to GistDetail
create Favorite, FavoritesController, update associations
FavoritesController actions
nest favorites under gists in RABL index; update initialization to fetch gists and only bootstrap current user
add client Favorite; torturously fix client Gist to nest only current user's favorite (or null);
update readme
finish Phase II??????