Getting Bootswatch LESS file to work in Visual Studio

I have installed Web Essentials 2013 for Visual Studio Update 3.

This has an LESS compiler in it which seems to work.

I created a new WebForms project which has bootstrap included

Then I installed the twitter.less NuGet package.

Then I copied the variables.less and bootswatch.less to the content folder from Bootswatch.

Then I added the import lines to the bootswatch.less file for /bootstrap/mixins and variables

When I go and view the page, NO CSS formatting shows up.

I am sure I am missing a step, but I cannot figure out what it is and after two hours of Googling, cannot figure it out.

Please help. Note this is Web Forms, NOT MVC

Thanks!