Re-writing microcosm in Go

This is a nice challenge too.

I've not yet seen web apps written in Go, only web services and systems.

There are some things that don't seem to exist, so I'm having to create those. i.e. the Django template tags, Go has an equivalent capability called template funcs but there are no open source generic ones I've found so I've had to create that https://github.com/buro9/funcs

This is then included in the Go microcosm thing.

Then there are other things that seem less mature in the Go templating. For example the idea of having multiple dependencies... that lots of templates may share some common template, or derive from the same parent template. So I'm going to have to find a smart way to declare a DAG (directed acyclic graph) of dependencies so that each compiled template isn't some sprawlingly huge thing.