Extends README with many more details.

Also removes some copy/paste errors.
Merge pull request #2 from trek/extend-readme

Extend the README with many more details
Add `files` option.

This allows `broccoli-funnel` to be mostly a drop in replacement for
`broccoli-static-compiler` when you have a specific list of files.
Merge pull request #4 from rwjblue/add-files

Add `files` option.
Bump version.