Merge 0.9 into master (warning: huge diff)

* Make Upstart script more fault tolerant and easier to debug

* update readme

This situation typically only arises in tests...

We now sneakily chain in the errors directive if gzip is present but
not errors. This change fixes #616.

These changes span work from the last ~4 months in an effort to make
Caddy more extensible, reduce the coupling between its components, and
lay a more robust foundation of code going forward into 1.0. A bunch of
new features have been added, too, with even higher future potential.

The most significant design change is an overall inversion of
dependencies. Instead of the caddy package knowing about the server
and the notion of middleware and config, the caddy package exposes an
interface that other components plug into. This does introduce more
indirection when reading the code, but every piece is very modular and
pluggable. Even the HTTP server is pluggable.

The caddy package has been moved to the top level, and main has been
pushed into a subfolder called caddy. The actual logic of the main
file has been pushed even further into caddy/caddymain/run.go so that
custom builds of Caddy can be 'go get'able.

The HTTPS logic was surgically separated into two parts to divide the
TLS-specific code and the HTTPS-specific code. The caddytls package can
now be used by any type of server that needs TLS, not just HTTP. I also
added the ability to customize nearly every aspect of TLS at the site
level rather than all sites sharing the same TLS configuration. Not all
of this flexibility is exposed in the Caddyfile yet, but it may be in
the future. Caddy can also generate self-signed certificates in memory
for the convenience of a developer working on localhost who wants HTTPS.
And Caddy now supports the DNS challenge, assuming at least one DNS
provider is plugged in.

Dozens, if not hundreds, of other minor changes swept through the code
base as I literally started from an empty main function, copying over
functions or files as needed, then adjusting them to fit in the new
design. Most tests have been restored and adapted to the new API,
but more work is needed there.

A lot of what was "impossible" before is now possible, or can be made
possible with minimal disruption of the code. For example, it's fairly
easy to make plugins hook into another part of the code via callbacks.
Plugins can do more than just be directives; we now have plugins that
customize how the Caddyfile is loaded (useful when you need to get your
configuration from a remote store).

Site addresses no longer need be just a host and port. They can have a
path, allowing you to scope a configuration to a specific path. There is
no inheretance, however; each site configuration is distinct.

Thanks to amazing work by Lucas Clemente, this commit adds experimental
QUIC support. Turn it on using the -quic flag; your browser may have
to be configured to enable it.

Almost everything is here, but you will notice that most of the middle-
ware are missing. After those are transferred over, we'll be ready for
beta tests.

I'm very excited to get this out. Thanks for everyone's help and
patience these last few months. I hope you like it!!

Add upstream directive

Fix for cleaned URL.Path

Fix for #854

Strip [] from IPv6 addresses for FastCGI.

Fixes #845.

systemd, README: Edit to account for the recent spike in reports

We have had three operators within a few days which ran into the same cause
and had not been able to figure out what went wrong.

addresses #833, #822

fix typo

Provides some more guidelines to operators on how to avoid running Caddy as root.

Introduces an user www-data, which really is a placeholder. Such an user with the same UID/GID combination is created on the most popular Linux distribution. I trust any operator can spot the difference to his/her distro and adjust the unit file.

User nobody is not used here to avoid two easy pitfalls: Such an user should not be able to access private keys (for TLS), and should not write private keys (we would do that with Letsencrypt).

The exemplary unit file for systemd is intentionally redundant at times, for
example dropping privileges which an unprivileged user "www-data" did not have
in the first place: To aid as fallback in case the file gets copied and an
operator setting UID to 0 (which reportedly happened in the past).

browse: Decorate external links with: noopener noreferrer

Setting these on external links prefents the target from manipulating this
page by "window.opener" with some widely deployed browsers.

Restart gracefully with in-process restart

Adding note on the rationale for Go 1.6