Base for Object-Oriented PHP Markdown
Sync with Markdown.pl 1.0.2b7 and other fixes
PHP Markdown 1.0.1d
PHP Markdown 1.0.1e
PHP Markdown 1.0.1f
Sync with Markdown.pl 1.0.2b8
PHP Markdown 1.0.1g
PHP Markdown 1.0.1h
Fixed bug with backslash before code span, fixed a speed issue with "unhash", and various other speed improvements.
Clean up of function detab.
Combined a few regular expressions.
Fixed release date.
Fixed misnested code block ending tags.

Code blocks were emited as <pre><code>...</pre></code> since 1.0.1i, where the two
ending tags are in the wrong order.
Prepared version 1.0.1j
Changed version number, release date and added version history.
Made settings overridable.
Added error suppression operator to setting defines so they may be overriden from
an external file without causing PHP warnings.
Updated version info
Fixed a problem with horizontal rules.
Added release date and notes for 1.0.1k.
Removed outdated remark in readme about being bundled with WordPress default installs.
More version number changes.