Bumped version number to 1.0.1q and added some version history.
Merge branch 'master' into extra

Conflicts:
	PHP Markdown Extra Readme.text
	markdown.php
Bumped version of Extra to 1.2.7.
Set PHP Markdown Lib version to 1.3. Merge branch 'extra' into lib.

Conflicts:
	Michelf/Markdown.php
	Readme.md
Typo in version number.
Merge branch 'extra' into lib

Conflicts:
	Michelf/Markdown.php
Removed constants for related versions of PHP Markdown from PHP Markdown Lib.

This is probably more trouble to maintain than it is worth. Also, people will mistake this for the version to use when filling bug reports.
Documentation revamp.