Add foundation gem.

See http://foundation.zurb.com/docs/sass.html
Add bower.json to install Zurb Foundation.
Add compass gem.
Remove foundation gem.

That's not really needed.
Ignore bin directory.
Add Compass project.

Created with ./bin/compass create compass.
Integrate nano with Compass.

The content of the Rules file is ok (routes might be
changed in the future, of course).

The compass/config.rb file contains an add_import_path
to load SCSS files from Foundation. The project_path
is mandatory because we have put config.rb in a
subdirectory (I will move it later).
Ignore .sass-cache and crash.log.
Always make a clean build.
Remove unused files.
Remove unused stylesheet.
Load Compass in lib/default.rb.

The conditional may not be needed there, but I
haven't tested it yet.
Add a tip about using NANOC_ENV.

See https://groups.google.com/forum/#!msg/nanoc/Vceo8ducqb0/2FhAWeZL5sMJ and http://clarkdave.net/2012/05/speeding-up-nanoc-compiles/.
Add uglifier and nanoc-javascript-concatenator gems.
Update default layout.
Clean up rules.
Compress CSS only when NANOC_ENV == production.
Import all of Foundation by default.
Enable JavaScript concatenators and Nanoc helpers.
Import Foundation JavaScript scripts.