Github Pages deployment is now using `git add -A` for compatability with Git 1.8.2+

Rakefile

@@ -247,18 +247,21 @@ end
 desc "deploy public directory to github pages"
 multitask :push do
   puts "## Deploying branch to Github Pages "
+  puts "## Pulling any updates from Github Pages "
+  cd "#{deploy_dir}" do 
+    system "git pull"
+  end
   (Dir["#{deploy_dir}/*"]).each { |f| rm_rf(f) }
   Rake::Task[:copydot].invoke(public_dir, deploy_dir)
-  puts "\n## copying #{public_dir} to #{deploy_dir}"
+  puts "\n## Copying #{public_dir} to #{deploy_dir}"
   cp_r "#{public_dir}/.", deploy_dir
   cd "#{deploy_dir}" do
-    system "git add ."
-    system "git add -u"
+    system "git add -A"
     puts "\n## Commiting: Site updated at #{Time.now.utc}"
     message = "Site updated at #{Time.now.utc}"
     system "git commit -m \"#{message}\""
     puts "\n## Pushing generated #{deploy_dir} website"
-    system "git push origin #{deploy_branch} --force"
+    system "git push origin #{deploy_branch}"
     puts "\n## Github Pages deploy complete"
   end
 end