This seems like it would be pretty simple but I cannot for the life of me figure it out. I'm simply trying to add a CSS class to the <ul> tag of my main navigation. I understand I can override the Menu.cshtml view in my theme however this would override every menu. I want to target my main menu specifically (really the menu widget in the Navigation zone). I attempted to use the Vandelay Classy module however this adds the class name to the most outer element (which in the menu's case is an tag).
Specifically, I am using the Twitter bootstrap and need to add the classes "nav nav-justified" to the <ul> object to conform. Again, this should only effect 1 menu (namely the menu in the navigation zone). I only plan to have 1 menu in the navigation zone, however if there's an alternative to targeting every menu in that zone (in the off chance I do have multiple menus in that zone) I'm all ears.
Thanks for your help.