Actually use guard for something useful and restart Unicorn when files change.

Guardfile

@@ -10,4 +10,10 @@
 # * :daemonize (default is true) - should the Unicorn server start daemonized?
 # * :config_file (default is "config/unicorn.rb") - the path to the unicorn file
 # * :pid_file (default is "tmp/pids/unicorn.pid") - the path to the unicorn pid file
-guard :unicorn, :daemonize => false, :port => 4567
+guard :unicorn, :daemonize => false, :port => 4567 do
+  watch('app.rb')
+  watch(%|api/.*\.rb|)
+  watch(%|lib/.*\.rb|)
+  watch(%|models/.*\.rb|)
+  watch(%|config/.*\.rb|)
+end