thumbor: Add a Thumbor image (Docker) for manipulating images (pictures)

Open-source, smart, on-demand image cropping, resizing and filters.
build.sh: Bump DATE to 20141023

No reason, just staying current.
package-cache/Dockerfile.template: Use package.accept_keywords/package-cache

Avoid:

  Step 3 : RUN echo '=net-proxy/package-cache-9999 ~amd64' >> /etc/portage/package.accept_keywords
   ---> Running in f36c7b3c1a27
  /bin/sh: /etc/portage/package.accept_keywords: Is a directory
  2014/10/29 11:23:21 The command [/bin/sh -c echo '=net-proxy/package-cache-9999 ~amd64' >> /etc/portage/package.accept_keywords] returned a non-zero code: 1
  failed to build package-cache

Since d8ed6289 (gentoo-layman/Dockerfile.template: Work around the
lack of Python 2, 2014-08-30), gentoo-layman is creating directories
for /etc/portage/package.accept_keywords and /etc/portage/package.use.
nagios: Add a Nagios image for service monitoring

The lighttpd config snippet is based on Gentoo's
lighttpd_nagios3-r1.conf from net-analyzer/nagios-core.  I've dropped
the auth snippets (you can put your auth in a reverse-proxy in front
of the nagios container) and shifted the URL namespace from /nagios to
/.  Because alias.url strips a trailing / [1], I had to tweak
var.basedir instead to get the root URL working.

I had to add mod_fastcgi.conf to avoid:

  NOT handling file as static file, extension forbidden

for *.php files.

I set timezones to avoid the following PHP warning:

  date(): It is not safe to rely on the system's timezone
  settings. You are *required* to use the date.timezone setting or the
  date_default_timezone_set() function. In case you used any of those
  methods and you are still getting this warning, you most likely
  misspelled the timezone identifier

[1]: http://redmine.lighttpd.net/projects/1/wiki/Docs_ModAlias
hubot/Dockerfile.template: Drop 'python' USE flag from Git

With a5a76d46 (gentoo-python: Remove Python 2, 2014-07-31), we no
longer have Python 2.  This Hubot image needs Git, and with the
'python' USE flag enabled, Git needs Python 2 (see d8ed6289,
gentoo-layman/Dockerfile.template: Work around the lack of Python 2,
2014-08-30).  The only interesting Git features enabled by the
'python' USE flag are the Bazaar and Mercurial remote helpers, and
even they were removed in Git 2.0.0 [1,2].

[1]: https://git.kernel.org/cgit/git/git.git/commit/?id=b2c851a8e67da752d8a5dbde5a9dae6e3428a4c9
[2]: https://git.kernel.org/cgit/git/git.git/commit/?id=896ba14d653c43bd7a43b6b291e941ab60855c04