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.

MMatten/lvm,autoclone/lvm2,laboshinl/lvm,ClouDesire/lvm,DrillingInfo/lvm,gionn/lvm,glensc/lvm,apcera/chef-lvm,susantomahato88/lvm,bryanwb/lvm,cookbooks/e4-lvm,gionn/lvm,autoclone/lvm2,codio/lvm,autoclone/lvm,acm1/chef-lvm,Altiscale/lvm,codio/lvm,vtolstov/cb-lvm,opscode-cookbooks/lvm,chef-cookbooks/lvm,vtolstov/cb-lvm,osminog/lvm,nitrous-io/lvm,MMatten/lvm,ChiefAlexander/lvm,glensc/lvm,Altiscale/lvm,bluestatedigital/lvm,jtimberman/lvm,ChiefAlexander/lvm,acm1/chef-lvm,MarkGibbons/lvm,apcera/chef-lvm,opscode-cookbooks/lvm,MarkGibbons/lvm,susantomahato88/lvm,ClouDesire/lvm,laboshinl/lvm,cookbooks/oc-lvm,autoclone/lvm,andrewpsp/lvm,chef-cookbooks/lvm,hoteltonight/lvm,andrewpsp/lvm