Code block export fix and docstring improvements

This release fixes a bug where the last character of a code block would get trimmed even if it wasn't a stray newline, as well as improving docstrings.

I'm also attempting to match release tags with version in header comment of the file.

1.5.0

Added a group for customization.

1.4.0

Some code refactoring, including changes that might affect performance.

Fixed a bug with emphasis inside of descriptive list terms.

1.2.2

removed unnecessary empty lines

1.2.1

bumped version

1.2.0

bumped version

1.1.0

added information about custom backgrounds

1.0.1

Small clean-up of code. Everything should work exactly the same as 1.0.

First release

This release works, but it might still lack some features, and it probably has some bugs in it.