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.

josephholsten/opscode-cookbooks-resolver,opscode-cookbooks/resolver,phlipper/resolver,caquino/resolver,bakins/resolver,jblaine/resolver,Shopify/chef-resolver,cookbooks/oc-resolver,mattray/resolver,jzmudzinski/resolver,chef-cookbooks/resolver,ichilton/resolver,chef-cookbooks/resolver,opscode-cookbooks/resolver,bbg-cookbooks/resolver