Improvements for markdown parsing.

test/data/simple_markdown.md

@@ -0,0 +1,30 @@
+# I'm a level one header
+I'm some text under level one
+
+## I'm a level two header
+I'm some text under level two
+
+```
+I'm a code block
+```
+
+I'm a line under the code block, with some `inline code`.
+
+### I'm a level three header
+I'm a bullet point list:
+
+* First point
+* Second point
+* Third point
+
+With a [hyperlink](www.imahyperlink.com) embedded.
+
+# I'm another level one header
+
+I'm some inline math $a = b + c$ and I'm some standalone math:
+
+$$
+d = e + f
+$$
+
+![This is an image](https://myoctocat.com/assets/images/base-octocat.svg)