Nested replies working

In a rather rudimentary fashion but with a bit of spit and polish they
ought to look nice. Unfortunately we manage the display state along
side the structure of the comments, may need to apply core.async to
make this less nasty. Or possibly just ignore it on the server
side (when that gets implemented).
Add script/ to .gitignore
Add some pretty

Use some else's hard CSS work to make it easier on the eye. Still far
from the what it will look like ultimately but the unstyled look was
giving me eyestrain.