open named links in new window, @snicker this will not work for links…

… auto detected by marked, we should override this piece of code https://github.com/chjj/marked/blob/master/lib/marked.js#L578 but i am not sure it is possible to do without overriding the whole function

public/js/directives/directives.js

@@ -100,7 +100,7 @@ habitrpg.directive('habitrpgSortable', ['User', function(User) {
           .replace(/'/g, ''');
       };
       if (cap[0].charAt(0) !== '!') {
-        return '<a class="markdown-link" href="'
+        return '<a target="_blank" class="markdown-link" href="'
           + escape(link.href)
           + '"'
           + (link.title