microformats.css with inline images (data-uri base64)

- add microformats icons
- Compass function for data-uri
- set /yaml directory as Compass image directory (Gruntfile.js + config.rb)
- copy images from yaml-sass into yaml (Gruntfile.js)
- Do copy task just before compass task, so the images could be found by Compass image functions (Gruntfile.js).