* Metadata.json can be generated with the rake tasks.
* Use 'metadata[cookbook]' and 'metadata_all' to generate .json.
* Application readme needed a few more clarification points.
The rakefile shouldn't delete the metadata task, since the
ability to generate JSON metadata from the cookbooks directory
is still useful.
Lets also ship the metadata in JSON in the cookbooks, so others can
make use of it without having to run any Ruby.
