metadata task and json data

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.

Rakefile

@@ -41,6 +41,6 @@ task :build_bootstrap do
 end
 
 # remove unnecessary tasks
-%w{update install roles ssl_cert metadata}.each do |t|
+%w{update install roles ssl_cert}.each do |t|
   Rake.application.instance_variable_get('@tasks').delete(t.to_s)
 end