support --repo CLI option

bin/gh-pages

@@ -10,6 +10,8 @@ program
       'base directory for all source files')
   .option('-s, --src <src>',
       'pattern used to select which files should be published', '**/*')
+  .option('-r, --repo <repo>',
+      'URL of the repository you\'ll be pushing to')
   .option('-b, --branch <branch>',
       'name of the branch you\'ll be pushing to', 'gh-pages')
   .option('-t, --dotfiles', 'Include dotfiles')
@@ -17,6 +19,7 @@ program
   .parse(process.argv);
 
 ghpages.publish(path.join(process.cwd(), program.dist), {
+  repo: program.repo,
   branch: program.branch,
   src: program.src,
   dotfiles: !!program.dotfiles,