[FIX] Setting InMenu to false will result in a Exception

If InMenu or Visible is set to False no Meta information will
be set for the page array and the rendering of the menu fails
as soon you try to access a index other then children.

Don't add pages to the array if they are set to InMenu/Visible False
Merge pull request #4 from Kollode/menuBugfix

[FIX] Setting InMenu to false will result in a Exception