Fixeserusev/parsedown-extra#67.
This introduces PHP 5.3+ late static binding to the Singleton pattern in Parsedown.
It will return an instance of Parsedown which inherits the class which
called the `instance()` method rather than always returning instance of just `Parsedown`.
Tests are testing this feature with a test class which inherits from Parsedown.
Notice that calling `instance()` with the default arguments after an instance of
`Parsedown` was already created, it will return it even though it is from just
an instance of `Parsedown`. So this is fixing the problem just partially.
Resolves#106.
This change introduces a new option - `noMarkup`. You could set it the
`setNoMarkup()` method similar to the `setBreaksEnabled()` one.
Example usage:
``` php
<?php
$parsedown = new Parsedown();
$parsedown->setNoMarkup(true);
$parsedown->text('<div><strong>*Some text*</strong></div>');
// Outputs:
// <p><div><strong><em>Some text</em><s;/strong></div></p>
```
You could run the Parsedown testsuite only with:
phpunit --testsuite ParsedownTests
And you could run the Standard Markdown one with:
phpunit --testsuite StandardMarkdown
See more at http://standardmarkdown.com/
