Remove strange getNodeTypes method from NodeController

[ahonor]

Remove the following:

    def getNodeTypes(){
        def response = []
        List origList = Topic.executeQuery( "select  new map(T.id as id, T.topicName as topicName) from Topic T");
        List delList = PostTopics.executeQuery( "select  new map(T.id as id, T.topicName as topicName) from Topic T left join T.posts P where P.post.id=?",[params.id.toLong()]);
        List addList = origList - delList

        //List origList = NodeType.findAll()

        response = [dellist:dellist,addlist:addlist];
        render response as JSON
    }

Similar to #187

See #169