Examples with including files
Merge branch 'master' into examples
Fixed attribute string: Removed double whitespace between the key-value pairs.
Renamed the getContentType() method.

It's actually the MIME type which is returned and then used for the HTTP Content-Type header field.
Added support for atom:link elements with relation=self. Fixes #5

See http://validator.w3.org/feed/docs/warning/MissingAtomSelfLink.html
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Fixed warning on RSS2 example: Image title didn't match channel title.
Merge branch 'examples'
Fixed warning on minimum RSS2 example: Image title didn't match channel title.
Implemented function to add custom XML namespaces. This fixes #9.

The namespace prefix and name can be set by invoking the addNamespace method of the Feed class.