Fixing fenced code blocks to allow classes to be added. Also the newline callback regex seemed to not be working, so I removed the ^ character from before \n.
Fixing CSS class regex.
Restoring newline callback to correct original format.
Adding ability to add attributes to code blocks. See function comment for syntax.
Updating fenced code blocks as per discussion in issue #7.
Updating HTML hashing for fenced code blocks.
Add support for header classes via {.class}
First pass at combining id and class attributes in a single curly brace set
Changes to allow both header id and classes in same curly brace set, but only in atx-style headers
Forgot to get rid of an echo
Adds header classes to setext-style headers, fixed regex issues so spaces are treated correctly
Full support for header id & class attributes in the same set of curly braces.
Full support for header classes and id in same set of curly braces.
XML-style empty tags were not recognized correctly when the / was not preceded by whitespace. Also made the regex a little more strict, so that </br/> wouldn't be seen as a valid tag.
Merge branch 'master' into extra

Conflicts:
	PHP Markdown Extra Readme.text
Added multiple footnote backlinks when footnotes have multiple references.
Adding support for class attribute in headers.

Merge remote-tracking branch 'mmcclimon/extra' into extra

is necessary,
Refactoring of the header attribute parser in a more generic "Extra Attribute Parser".
Added support for fenced code block (refactored while merging).

Merge remote-tracking branch 'coreyworrell/extra' into extra
Updated readme to talk about attributes on fenced code blocks.