feat(sciphi): Added static blog engine, sort of

Markdown posts with JSON metadata are now processed by gulp and put into JSON files that can be
fethed asynchronously by the sciphi app, which does not yet exist.

Oh, there's also a starter sciphi page, but there's really nothing there yet.
feat(sciphi): Created basic grid display for posts
feat(sciphi): Added filtering by tag

Clicking an icon now displays a list of tags in a full-screen modal; clicking any tag filters the
list of posts.
feat(router): swapped manual routing to ui.router