Use X-VSF instead of X-SEC to match the rest of the vcl
Merge pull request #2 from ssm/fix/headers

Use X-VSF instead of X-SEC to match the rest of the VCL
updated the submodules
Fixing VCL for IE<8 users

Sadly IE is sending a "Keep-Alive" Connection header instead of a "keep-alive".

The change makes sure we don't check the casing for that rule.
Merge pull request #4 from gboddin/patch-1

Fixing VCL for IE<8 users