* Added support for equals and dash style headings.
* Added markdown-show-version.
* Ability to preview markdown output in a buffer (markdown) or
in a browser (markdown-preview). Markdown command is customizable.
* Made HR length customizable through markdown-hr-length.
* Made bold and italic style customizable through markdown-bold-underscore
and markdown-italic-underscore.
* Made keybindings more like those of html-helper-mode.
* Added image insertion (markdown-insert-image).
* Font lock for code fragments with double backticks.
* Added blockquote-region function and insert-blockquote keybinding.
* Don't highlight escaped literals such as \* or \_.
* Added header insertion commands for H1-H5 (markdown-insert-header-n).