added a touch more information to the apache configuration instructions
In the text there is a section about how to serve the assets with far-future headers. The snippet that is proposed doesn't work on Ubuntu 11 (probably others) as mod_expires is not enabled out-of-the-box. I noted this, and gave an example of how to load mod_expires with a2enmod.
|@@ -473,6 +473,9 @@ Precompiled assets exist on the filesystem and are served directly by your web s|
|+# the following requires mod_expires|
|+# on Ubuntu issue:|
|+# sudo a2enmod expires|
|# Use of ETag is discouraged when Last-Modified is present|
|Header unset ETag|