Complete test coverage for config/setup/markdown.go

ext: Initial tests for the extensions middleware

gzip: Const for wildcard extension (and added test)

gzip: Make it gzip again

Removes mimes filter in favor of extensions filter (might be temporary)

preliminary test case for config/setup/markdown.go

git: Remove from core (available as add-on)

i.e. included files are also parsed as templates

Massage some verbiage

fastcgi: Fix for Issue 141: index not found, 502 Bad Gateway.

The grammar felt off on the sentence I changed. You can take or leave this PR, I won't be offended if you dislike my suggestion.

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)