In Visual Studio 2015, when I create a brand new solution with a brand new ASP.NET 5 project, I see the Manage Bower Packages... context menu when I right-click
Adding a Bower configuration file to the project solves this problem. This can be done by right-clicking the project, selecting "Add new item" from the menu and then "Bower configuration file" from the item templates. Visual Studio restart may be required to get the menu item to show up.