title: .gitignore file not ignoring VS files
body: <p>I have inherited a Visual Studio project, and the git repo did not include a .gitignore file. I downloaded the one located here <a href="https://github.com/github/gitignore/blob/master/VisualStudio.gitignore" rel="nofollow noreferrer">https://github.com/github/gitignore/blob/master/VisualStudio.gitignore</a> and pushed it to all branches (we maintain several versions of the project and have a separate branch for each).</p>
  
  <p>However, whenever I open the project in Visual Studio, git is still tracking the .user files generated by VS, even though they are included in the .gitignore file.</p>
  
  <p>Have I missed a step somewhere?</p>