Preserve file metadata (esp. timestamps) when copy static files to output folder.
Fix invalid atom feed id:tag

Fixes #1039: The atom feed generated produces an invalid attribute
id:tag when SITEURL has something different that http or it contain
a subdirectory, such as:
  * https://myblog.com/
  * https://mysite.com/blog
  * http://mysite.com/blog
Merge pull request #1122 from calfzhou/copy_path

Preserve file metadata (esp. timestamps) when copy static files to output folder.
Add doc about use of metadata per article in custom templates
Merge pull request #1150 from madewulf/master

Add doc about use of metadata per article in custom templates
Various fixes to theme documentation
Log a warning when the HTML reader encounters a nonconformant meta tag

Instead of throwing an exception and skipping the HTML file, log a
warning with a message which makes it more obvious as to what happened.
Merge pull request #1151 from malept/html-reader-non-conforming-meta-tags

Log a warning when the HTML reader encounters a nonconformant meta tag
Added a new ''modified:' metadata tag to be able to specify the
publication time and date and the last modified time and date
independently.

This makes it possible to access the last updated date with {{ article.locale_modified }} in templates.
Additionally, an already delivered feed entry can be corrected by changing the modified date and time, as it is used for atom:update
/ rss pubDate field now.
Merge pull request #1148 from florianjacob/modified_metadata

Added a new ''modified:' metadata tag
Merge pull request #1140 from gpoo/fix-invalid-atom-feed-uid

Fix #1039 Atom feed for sites using HTTPS or a subdirectory
Build Pelican wheels in universal format

Including a binary wheel when uploading Pelican to PyPI will speed up
installation for the Pelican community. This change ensures that the
Pelican wheel is compatible with all supported Python versions. For more
information, see: https://pypi.python.org/pypi/wheel