Fix #81: could not get paragraphs in Markdown due to the interaction between smiley and Markdown. Refactored the smilify code to use a series of regular expressions over the text when working with markdown.

{% if show_button %}
<a href="{% url forums-edit_post id=post.id %}"><img src="{{ MEDIA_URL }}icons/page_edit.png" alt="Edit post" title="Edit post" /></a>
{% endif %}