Making cards look more like the originals.

Moving styling from JS to CSS.
Introducing type-specific card type CSS classes for that.

The style has been adjusted to correspond to the demo cards shown in
the Glass Talk at SXSW.
Merge pull request #2 from kaktus621/card-ui

Making cards look more like the originals
Same timestamp placement for all types of cards
Better client secret handling
Update readme
Make proper use of git submodule / updated readme with repo setup instructions
Start implementing a 'proper' Glass UI with swipes and everything
Adjust Clock card to demo screenshots