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.

evidenceprime/couchdb-cookbook,the-galley/chef-couchdb,the-galley/chef-couchdb,wohali/couchdb-cookbook,cookbooks/oc-couchdb,Azrael808/couchdb-cookbook,wohali/couchdb-cookbook,cookbooks/bg-couchdb,bratke/couchdb,wohali/couchdb-cookbook,Azrael808/couchdb-cookbook,the-galley/chef-couchdb,evidenceprime/couchdb-cookbook,lgierth/couchdb-cookbook,evidenceprime/couchdb-cookbook,Azrael808/couchdb-cookbook