Variable macros expanded inside of code sections shouldn't interrupt the formatting

[NQNStudios]

What happened

While writing a new example for PR #75, I discovered that the following Markdown pattern yields ugly results:

Here's some markdown.
{$variableMacro}
Here's more Markdown.

What the result looks like, is three separate code blocks, the middle one containing the contents of variableMacro.

Steps to reproduce

Set up a story with Markdown as above, or simply pull #75 and run the linear example.

Expected behavior

I had expected the variable to be inserted inside the existing code block, not to interrupt it and cause a visual separation.