[UPDATE] license
[REFACTOR] Replace [M↓] with Markdown
[REFACTOR] The source button should actually be named HTML Preview
[REFACTOR] The Synax and Extra Syntax buttons should be named: Docs for [Markdown] and
                   [Markdown Extra]
[REFACTOR] textarea boxes: please use an outer-glow instead of changing the border
[UPDATE] marked.js added headerPrefix, internally
[UPDATE] FileReader.js - v0.99
[UPDATE] highlight js
[FEATURE] File upload via clipboard and selecting multiple files
Also maybe give an indication that it is possible to drag and drop an image, like here on GitHub.
[FEATURE] When image drag and drop is enabled, have the ability to hide the Insert Image button. Via System -> Configuration