Revert rollback of v0.2.38

This reverts commit 878794345c9d94047ff353749be4f893900bf25e.
Fixed underscore cookie match in varnish vcl

Fixes #84
Forcing minimum MaxClients value of 5

This may end up forcing low end servers to swap (and thus thrash them), but it's better than inadvertantly throttling them where they can only handle 1 or 2 concurrent connections

Fixes #89 (more or less)
Removed some version changes that shouldn't have been there (part of the revert)
Simplified wp cookie regex (based on cookie regex we're using in production.vcl)
Merge pull request #90 from genesis/84-varnish-admin-issues

Varnish/Apache issues