...instead of /go-{repo}/{repo}

This works better for us, as we have /writeas/go-writeas and
/snapas/go-snapas

Allows you to configure a different code hosting site besides
github.com, like one powered by Gitea or Gogs.

For details see:

https://github.com/go-fsnotify/fsnotify/issues/1

This also includes further tweaks to unify the handling of
FullVersion across the go-get and the package page rendering.

Besides enabling support for repositories with no master branch
defined, this will also make a bare "git clone" on a gopkg.in
repository create a local branch with the proper content and name.

Fixes #20.

Fixes #25.

See https://github.com/golang/gddo/pull/212 for the corresponding
change to godoc.org.

A few minor tweaks.

Closes #1.

Fixes #15.