Merge pull request #8 from am11/super-markdown

Merge: Resolved Conflicts
Markdown: Prevent Undo failures

Complete any active undo context if
an exception is thrown from a command.
Markdown: Close UndoContext instead of aborting
Markdown: Disable HTMLX formatter

The formatter doesn't work properly with
Markdown for a variety of reasons.
Markdown: Disable Minify