add simple Rakefile with build and deploy tasks

Rakefile

@@ -0,0 +1,12 @@
+desc "build site locally"
+task :build do
+  sh "bundle exec jekyll build"
+end
+
+desc 'publish site'
+task :deploy do
+  user = 'robrauch'
+  server = 'www.iaa.tu-bs.de'
+  path = '~/www/'
+  sh "rsync -rtzh --delete _site/ #{user}@#{server}:#{path}"
+end