Merge pull request #1 from penyaskito/master

vcl_hash example for SSL in a LoadBalancer like Pound or Nginx.
comment reformatting on drupal_base.vcl
drupal_base.vcl Mix & Fun of X-Forwarded-Proto thanks to penyaskito
added debugging headers in vcl_fetch
note added for the convenience of restarting POST request on backend failures
Added link to other GitHub projects
added sample config for gzipping content on Varnish
added proper vary header to gzipping example
added support for HTTPS session cookies
Some more comments added as suggested by pcambra
added placeholders TO-DOs to give a better debugging info
fixed typo
fixed header name inconsistence
added external resource