Feed::utf8_for_xml() method used in the Feed::makeNode() method.

This is better, since 'addEnclosure' means 'add one *more* enclosure'.

* setEnclosure: Expects an integer for length parameter greather than zero.
* setAuthor: email parameter is also used in RSS2 feeds.
* setId: The isPermaLink attribute can be set (RSS2 only).

Since this project requires PHP >= 5.3 anyway, the check for this version is not needed anymore in Item.php.

It's now possible to specify an email address and an URI.

This was previously already possible by using the custom addElement function.

- Make it easy to get a <content> element on Atom entries
- Also spells "enclosure" correctly - "setEncloser" -> "setEnclosure"
- Fixes Atom test file on case-sensitive filesystems
- Tack a date_default_timezone_set() on tests, to avoid warnings

A minimal set of changes to support PSR-0-style autoloading:

- rename base class to \FeedWriter\Feed and FeedItem to \FeedWriter\Item
- break types out into \FeedWriter\ATOM, \FeedWriter\RSS1, and
  \FeedWriter\RSS2
- use class constants for versions
- make generateFeed() return a string rather than doing any IO itself
- add printFeed() to do output, if needed

My rationale for the last 2 items on that list is that our web framework
expects me to pass around strings, not do direct IO. I imagine needing
to grab the output and stash it in a variable or what-have-you is
a common use case, and it felt silly to have to wrap this in an
output buffer to accomplish that.

* Only accept instances of FeedItem
* Only accept instances of FeedItem with the same feed type

* Set the author element of the feed item
* Set a unique identifier (for RSS2 & ATOM)

(SVN import from repo. "www" @ revision 612, made by "Michi" on Oktober 17, 2010 (04:56:08))

* Passing of DateTime instances did not work
* The correct Content-Type header (depending on the feed type) is send to the browser.
* Fixed indentation
* Fixed node generation if no attributes available
* Remove last whitespace on attribute generation

(SVN import from repo. "www" @ revision 607, made by "Michi" on Oktober 4, 2010 (00:22:46))

(SVN import from repo. "www" @ revision 606, made by "Michi" on Oktober 3, 2010 (03:14:17))

The files are taken from the zip file available at Anis' website.