* fix: remove the src attribute of atom:content
The src attribute is to replace the inner content, not to mark its source.
RFC4287:
> 4.1.3.2. The "src" Attribute
>
> atom:content MAY have a "src" attribute, whose value MUST be an IRI
> reference [RFC3987]. If the "src" attribute is present, atom:content
> MUST be empty. Atom Processors MAY use the IRI to retrieve the
> content and MAY choose to ignore remote content or to present it in a
> different manner than local content.
>
> If the "src" attribute is present, the "type" attribute SHOULD be
> provided and MUST be a MIME media type [MIMEREG], rather than "text",
> "html", or "xhtml". The value is advisory; that is to say, when the
> corresponding URI (mapped from an IRI, if necessary) is dereferenced,
> if the server providing that content also provides a media type, the
> server-provided media type is authoritative.
* fix: move <language> to xml:lang
* fix: remove <webMaster> in atom
* fix: use ISO format to display date in atom & always have <updated>
* fix: use ISO date for feed <updated> in atom
* fix: add <link rel=self> for atom
12a75059dd