adding more usage links to readme
adding more usage links to readme

tenderlove/yajl-ruby,brianmario/yajl-ruby,sferik/yajl-ruby,brianmario/yajl-ruby,mrkn/yajl-ruby,sferik/yajl-ruby,tenderlove/yajl-ruby,brianmario/yajl-ruby,sferik/yajl-ruby