Attach all post resources to all page resources.  Now `hyde gen' works.  Also
fix up a couple of the unit tests.

Configured in a resource's metadata, creates copies of that resource, each of
which will receive its own `page' containing a distinct list of `posts'.

is present in the target directory. (Issue #21)
*   Bug Fix: Exceptions are now handled with `ArgumentParser.error`.
    (Issue #21)

This allow to handle media_url to external site (like
http://media.example.com).

BeautifulSoup is not compatible with HTML 5 and may mangle your
document. We provide a simple parser that should work in most cases.

This plugin adds `width` and `height` tags to `img` when they are not
present. It also adds them when only one of them is present
(respecting proportions).

Always first sort by name then by any attributes you want. Otherwise,
tests may fail.

Use strftime instead. There seems to be no dateformat filter in jinja
documentation.

Node.js tools may be installed in /usr/bin if installed by system
package tools or in ~/bin if installed by a default installation of npm.