Add CREATE EXTENSION entries from comments to blog.

[EvanCarroll]

I assumeed this is used like this

make;
psql -f *.sql

But I'm getting

ERROR:  could not access file "MODULE_PATHNAME": No such file or directory

Reading the posts in the comments on the blog I can see it's used like this,

I think you are right about _PG_fini, but it is still there in the code. But _PG_init called in case of CREATE EXTENSION too.

sudo make install;
psql -c'create extension log;''