It no longer uses regular expressions.
It supports both the Unix `{$ENV_VAR}` _and_ the Windows `{%ENV_VAR%}`
syntax.
Added test for both Unix and Windows env. syntax.

Added test for the fix of issue #304

For issue #304.

Added the Windows style ({%%}) for environment variables in Caddyfiles
(for issue #304).

This is work in progress for #304

Fixed bug where manually specifying port 443 disabled TLS (whoops); otherHostHasScheme was the culprit, since it would return true even if it was the same config that had that scheme.

Also, an error at startup (if not a restart) is now fatal, rather than keeping a half-alive zombie server.

Let's Encrypt

Conflicts:
	caddy/parse/parse.go
	caddy/parse/parsing.go
	config/config.go
	config/setup/controller.go
	main.go
	server/server.go

By chaining in a middleware handler and using newly exposed hooks from the acme package, we're able to proxy ACME requests on port 443 to the ACME client listening on a different port.

This fixes a bug with the -agree flag

Before, we were activating Let's Encrypt after all the directives were executed. This means their setup functions had access to potentially erroneous information about the server's TLS setup, since the letsencrypt package makes changes to the port, etc. Now, we execute all directives up to and including tls, then activate letsencrypt, then finish with the rest of the directives. It's a bit ugly, but I do think it is more correct. It also fixes some bugs, for example: a host that only has a catch-all redirect.

Windows Build: Remove PATH from output.

In testing, I've found that Windows doesn't release the socket right away even though the listener is closed, so calling caddy.Start() right after caddy.Stop() can fail. This change has server.ListenAndServe() try up to 20 times every 100ms to bind the listener, and only return an error if it doesn't succeed after 2 seconds. This might be kind of nifty for Unix, too, but there hasn't been a need for it yet.

startup/shutdown: test file

Also modified NewTestController to include a value for OncePerServerBlock

wrote startupshutdown tests and added OncePerServerBlock value in the NewTestController function of the controller.go file

Fix for issues #297 and #298

Add option to change delims in templates

Also improved/clarified some docs

The file path of the originally-loaded Caddyfile must be piped to the forked process; previously it was using stdin after the first fork, which wouldn't load the newest Caddyfile from disk, which is the point of SIGUSR1.