renamed github pages configuration task

Rakefile

@@ -276,7 +276,7 @@ task :set_root_dir, :dir do |t, args|
 end
 
 desc "Set up _deploy folder and deploy branch for Github Pages deployment"
-task :setup_github do
+task :setup_github_pages do
   repo_url = get_stdin("Enter the read/write url for your repository: ")
   user = repo_url.match(/:([^\/]+)/)[1]
   branch = (repo_url.match(/\/\w+.github.com/).nil?) ? 'gh-pages' : 'master'