Complete test coverage for config/setup/templates.go

Decouple git middleware from caddy core. Now available as an add-on at https://github.com/abiosoft/caddy-git.

Initial Test case for config/setup/templates.go

core: Handle address lookup and bind errors more gracefully (fixes #136 and #164)

Addresses which fail to resolve are handled more gracefully in the two most common cases: the hostname doesn't resolve or the port is unknown (like "http" on a system that doesn't support that port name). If the hostname doesn't resolve, the host is served on the listener at host 0.0.0.0. If the port is unknown, we attempt to rewrite it as a number manually and try again.

Test for webSocketParse function in config/setup

Modularizing config/setup/Websocket.go and test file for the same

errors: change missing errors file from error to a warning during parsing

browse: Ability to sort

setup: export functions and variables for external packages.

Tests for config/setup/internal.go

Tests for config/setup/log.go

fastcgi: fix #127

ext: test for function extParse

log: ensure the correct status is always logged