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.

Altiscale/rsync,osuosl-cookbooks/rsync,Altiscale/rsync,VertiPub/rsync,ftclausen/rsync,opscode-cookbooks/rsync,jbfavre/rsync,opscode-cookbooks/rsync,osuosl-cookbooks/rsync,ftclausen/rsync,VertiPub/rsync,VertiPub/rsync,cookbooks/oc-rsync,Altiscale/rsync,sinfomicien/rsync,stathy/rsync,cete/chef-rsync,osuosl-cookbooks/rsync,sinfomicien/rsync,chef-cookbooks/rsync,sinfomicien/rsync,chef-cookbooks/rsync,jbfavre/rsync,opscode-cookbooks/rsync,chef-cookbooks/rsync,jbfavre/rsync