Prevent matching "*.md.html" in URLs.

[benjie]

trafficstars

For example the PhoneGap documentation:

http://docs.phonegap.com/en/2.0.0/guide_getting-started_index.md.html

Is detected (incorrectly) as Markdown, making it extremely hard to read.

[sattes-faction]

+1 - I just wanted to post exactly the same example ;-)

[ShawnTalbert]

+1 same exact problem, please fix if you have time! I have to remember to disable the extension in chrome whenever I visit a site with .md.html files.

[jimbergman]

+1 also having this problem