Version 1.0.0 - Works pretty well perfect across all my projects.
* Escape special characters within preformatted text. Markdown does not
interpret within preformatted text, but RST tries to... This ensures
equivilant output
* Replace leading sets of 4 spaces with tabs in RST output, to simplify a lot
of the code and keep display the same
* Some additional logic on differeing whitespace and consecutive lines, cases
where MD inserts a linebreak but RST needs an explicit, and cases where they
are the same.