title: Subversive: how to add to svn ignore
body: <p>I am using Subversive and I have the same question as <a href="https://stackoverflow.com/questions/1066809/subclipse-svnignore">Subclipse svn:ignore</a>, but the solution did not work for me. Anyone knows how to add to svn:ignore files already added to a project with Sobversive? </p>
  
  <p>If I delete it and create it again, there is a red exaclamation ('!') icon and I am not able to add it to svn:ignore</p>