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.

Tiger66639/php,TranceLove/chef-php,Restless-ET/cookbook-php,sergiuionescu/php,synapsestudios/php,ck-1/php,dastergon/php,getoutreach/php,miketheman/opscode-php,chef-cookbooks/php,JasonSuave/php,Sauraus/php,VertiPub/php,adcuz/chef-cookbook-php,opscode-cookbooks/php,timurb/opscode-php,undertree/php,Tiger66639/php,dastergon/php,justinhj/php,opscode-cookbooks/php,sergiuionescu/php,thomascate/php,ebollens/chef-cookbook-php,wdalmut/php,MonkDev/chef-php,Nordstrom/php,synapsestudios/php,awartner/php,veered/php,inviqa/php,elisavmus/php,TYPO3-cookbooks/php,cburyta/php,edmunds-chef/php,alex-slynko-wonga/php,Nitecon/php,tezz123/php,getoutreach/php,scottatron/php,agopaul/php,ternarylabs/chef-php,beubi/cookbook-php,Pardot/php,TranceLove/chef-php,rshade/php,rackspace-cookbooks/rackspace_php,TYPO3-cookbooks/php,tulipretail/php,jgeusebroek/php,rjocoleman/php,Sauraus/php,VertiPub/php,teamsnap/teamsnap_php_config,solarce/php,chef-cookbooks/php,odolbeau/php,jmccaffrey42/php,edmunds-chef/php,hw-cookbooks/php,kbinani/chef-cookbook-php,adrienbrault/opscode-cookbooks-php,floodedcodeboy/php,periscopedevelopment/php,rshade/php,patcon/php,streamlinesocial/php,Dorozhko-Anton/php,winmillwill/php,bensweet/php,ranjithamca/php,aopeng/docker,wikidi/php,priestjim/chef-php,chrisroberts/php,protec-cookbooks/php,trinitronx/php,team-lab/lab-chef-php,TakatoshiMaeda/php,kriswallsmith/php,nlisgo/chef-opscode-php,durana/php,BRMatt/php,ck-1/php,parisholley/php,awartner/php,TYPO3-cookbooks/php,tomfriedhof/opscode-cookbooks-php,peaceman/php,cookbooks/oc-php,priestjim/chef-php,ashton/php,kangaechu/php,inviqa/php,kanonji/php,Mordred/cookbook-php,toyamarinyon/php,VanTanev/chef-php,Restless-ET/cookbook-php,MonkDev/chef-php,richardc/php,TranceLove/chef-php,NREL-cookbooks/php,priestjim/chef-php,ranjithamca/php,muneando/php,rmasters/opscode-php,beubi/cookbook-php,periscopedevelopment/php,giorgio-v/php,dldinternet/php,koelkast/php,kambayashia/cookbooks-php,Dorozhko-Anton/php,KLab/php-cookbook,tcroiset/php