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.

epcim/openldap,john5223/openldap,PaytmLabs/chef-openldap,broadinstitute/openldap,chef-cookbooks/openldap,rackspace-cookbooks/openldap-deprecated,John-Appleseed/openldap,apealive-cookbooks/openldap,johnbellone/openldap,skemper/openldap,cookbooks/oc-openldap,mattjalexander/openldap,mattjalexander/openldap,glensc/chef-cookbook-openldap,computerlyrik/openldap,cpuguy83/openldap,blasdelf/openldap,PaytmLabs/chef-openldap,temujin9/openldap,dcallao/openldap,HomesiteInsurance/openldap,kuleszaj/openldap,someara/openldap,fatboy/openldap,chef-cookbooks/openldap,HomesiteInsurance/openldap,tomduckering/openldap,pwillred/openldap,skemper/openldap,openitdotcom/chef-openldap,dcallao/openldap,fatboy/openldap,tknetworks-cookbooks/openldap,opscode-cookbooks/openldap,niku/openldap,StepInfo/openldap,opscode-cookbooks/openldap