Favor FlowRouter.url over Meteor.absoluteUrl

It hides the leading slash treatment as an hidden implementation
detail.

server/lib/utils.js

@@ -5,24 +5,3 @@ allowIsBoardAdmin = function(userId, board) {
 allowIsBoardMember = function(userId, board) {
   return board && board.hasMember(userId);
 };
-
-// todo XXX not really server-specific,
-// so move it to a common (client+server) lib?
-Utils = {
-  /**
-   * If text starts with a / will remove it.
-   * @param text
-   */
-  stripLeadingSlash(text) {
-    // we need an actual text string
-    if (!text) {
-      return text;
-    }
-    // if starting with slash
-    if (text[0] === '/') {
-      return text.slice(1);
-    }
-    // otherwise leave untouched
-    return text;
-  },
-};