Add `fonts` task to generator

In cases where a Bower package defines font assets (identified as
`.eot`, `.svg`, `.ttf`, and `.woff` files) these will be copied to
`dist/fonts` upon building the app.

Discussed in yeoman/generator-gulp-webapp#60
Merge pull request #61 from kasperisager/fonts-task

Add `fonts` task to generator
Bump to 0.0.6
minor compass support fix