Fix bug with test req_query

`test` requires quotes around variables with =, or it can fail when
the variable is missing (a list of 0). In this case it would with an
ugly error message.

I'm not 100% sure that this change is necessary - req_query should in
theory always contain one item - but there's no harm in adding the
double quotes.

Fix link in readme

Fix error on macOS

On Linux, `file` uses the `-i` option for mime types, but on macOS
that option is called `-I`. The long `--mime` option is cross-platform.

Support running `main.fish` from a different dir

Allow using other shells in %%%

Thanks Tim Clifford for the patch!

Fix validation for leading and trailing slashes in URL

Fix normalisation of dot paths

Update documentation

Support Spartan and Mercury protocols

Support and prefer ncat

Add req_query variable

Add paragraph count to gemlog intro

Fix mime meta line

Normalise path to remove /./

Add some of my functions to the default includes

Allow showing source and true multiline eval

Explain and improve certificate generation

Freeze personal and serve in gitignore

Add directory index preference

First version