readme - add some more plugins to the list
readme - add some more plugins to the list

ember-cli/broccoli,osxi/broccoli,ixisystems/broccoli,gabesoft/broccoli,broccolijs/broccoli,ember-cli/broccoli,ember-cli/broccoli,osxi/broccoli,gabesoft/broccoli,broccolijs/broccoli,broccolijs/broccoli,broccolijs/broccoli,rwjblue/broccoli,jnicklas/broccoli,ixisystems/broccoli,gabesoft/broccoli,osxi/broccoli