Fix missing tag
Minor wording fixes to make it clear where the header goes
Default log size is 80MB, not 90MB
Reorder log vs tunable parameters

It gives better flow to first talk about the objects and then how to
tune them. The tunable parameters chapter also belongs closer to the
threading model one that follows it.
Default session workspace is 65536
The counter for number of threads in varnishstat is n_wrk
Make it clear that the results are for two different parts of the exercise
Change order of bullets to match those of the sections following
One dot too many in IP address
Smart bans dopn't require specificaly req.http.host

They require any/all fields you're going to do banning on
Don't refer to the "saint list" as "ban list", since it causes confusion
vcl_fetch can't return pass, it returns hit_for_pass these days
Update images attached to previous commit

Made using a different version of graphviz it seems, that's why the
changes are big.
Remove vcl_pass function that can never be reached
Include health check example on slides
Merge pull request #26 from mhagander/fixups

Fixups