Remove metadata.json and update application readme.
Remove metadata.json and update application readme.

* 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.

chef-cookbooks/sqlite,opscode-cookbooks/sqlite,cookbooks/oc-sqlite,hw-cookbooks/sqlite,ddux/sqlite,jtimberman/sqlite,cookbooks/hw-sqlite,reidab/sqlite