Update README.
Simplify MultiMarkdown filter.

See also https://github.com/nanoc/nanoc/pull/385.
Fix comment in multimarkdown filter.
Do not modify arguments in multimarkdown filter.
Add an :external filter to run an external program.

The filter assumes that the external program takes its
input from stdin and sends the processed input to
stdout.
Minify HTML using the external tool htmlcompressor.

htmlcompressor can be installed with

    brew install htmlcompressor
Revert "Minify HTML using the external tool htmlcompressor."

This reverts commit 1d5eb1bcd7443c9a7c05daec2fe7e10c39c4c5b6.
Update README.
Add parameter in Google Analytics partial.
Make the multimarkdown filter a proxy for external.
Remove Font Awesome.
Remove Font Awesome related imports.
Add link to Font Awesome 4.2.0 in default template.
Fix path to jQuery.js.
Move Compass config to project root.
Update README.md.
Update README.md.
Update README.
Update README.
Use nanoc-external filter.