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-perl,josephholsten/opscode-cookbooks-perl,Pritesh242/perl,eych/perl,hw-cookbooks/perl,glensc/chef-cookbook-perl,gwaldo/perl,jtimberman/perl,cookbooks/oc-perl,zts/perl,chef-cookbooks/perl,faizk/perl,opscode-cookbooks/perl,stevenolen/chef-perl,VertiPub/perl,Tealium/perl