add default theme

```
acrylamid init new-blog
move new-blog\theme acrylamid-themes\default
```
create Bootstrap container, with default acrylic content
unmodified minimal Boostrap base
switch to Bootstrap css, javascript
Add acrylic.css, place to build a merged default

Add acrylic.css. This is where we'll slowly start to build a merged
default Acrylamid and Boostrap theme, which can serve a base for more
varied Bootstrap variants; show nav list inline
glyph icons for nav; drop rss nav

Some sensical defaults from the base Bootstrap css classes,
http://twitter.github.com/bootstrap/base-css.html ;
use glyph icons for the nav bar links;
Drop rss link and just provide atom. I see no reason for both (c.f.
http://stackoverflow.com/questions/1076750/rss-or-atom)
apply basic min/max-width and auto centre

Haven't been able to make sense out of the grid layout systems yet, so
just apply a basic min & max width and auto-center the body.
More space between the nav elements
center header
center align header & footer, give vertical space
Merge pull request #2 from maphew/master

2 themes: Default & Basic Bootstrap