Readme file box with markdown support

[mprochowski]

• Added box with a preview of the readme file in the repository view, if a file exists. (eg README, readmd.md, readme.markdown etc.)
• Markdown support with showdown.js library (http://github.com/coreyti/showdown)
• Screenshot: http://prochowski.pl/projects/gitlist/gitlist-readme-box.png

[mprochowski]

I know that bb2k did the same functionality but with a different solution. - #59

[klaussilveira]

I'm not sure if i like rendering Markdown on the client-side. However, i have to agree that there isn't a decent Markdown renderer in PHP and Showdown is clearly well-written. What do you guys think?

[mprochowski]

I checked few PHP markdown parsers and i must say that Showdown gave me the best result. I know that markdown rendering on the client-side is not good solution, but for the effect that Showdown gave, i think is worth to use it.

[bb2k]

showdown seems to have a better renderer even if i dont see any différences in my example.Anyway The mablo solution has the advantage of keeping the cache system as well

Concerning the client side parsing, i don't think the size of the readme files are enough big to decrease performances

[mprochowski]

@bb2k: done :)