Implemented publish/subscription + routing

-Removed autopublish and setup publish and subscription to 'posts'
-Publish implemented in /server/publicaion.js and subscription moved to the Router.Config for the purposes of adding a waitOn function
-Routing implemented for '/' which uses postList template, and '/posts/:_id' which uses postPage template
-Created discuss button that will linkk to '/posts/:_id' with its :_id
-Implemented a notFound template (in template/application) for wrong url. For non-existent id's, added onBeforeAction which will direct it to the notFound template.