Allow HTML to be used in the markdown files.

There are certain situations where we need to add a little HTML along with our markdown. Currently any HTML in the markdown is sanitized (converted to entities) with no way to turn this setting off (since we are using Laravel's VIEW method of implementation). View files are stored files created by the developer, not users, and should be defaulted to allow HTML. If there is any inserted untrusted HTML, such as coming from the database or a form submission, then the developer is already accustomed to sanitizing it (html_entities, e, etc...) before being parsed by the markdown parser. I think allowing HTML will also be more consistent to what we expect when using views normally in Laravel. As a compromise, we can leave sanitation turned on for the views that are simply .md. I only made the change for .php.md and md.blade.php files in the fork.