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.

DonorsChoose/chef-openssl,e100/openssl,cookbooks/oc-openssl,juliandunn/openssl,h4ck3rm1k3/openssl,hw-cookbooks/openssl,chef-cookbooks/openssl,rhass/openssl,GannettDigital/chef-openssl,Jesterovskiy/openssl,frkline/openssl,bbg-cookbooks/openssl,opscode-cookbooks/openssl,cookbooks/hw-openssl