Add syntax highlighting for source files.

[oxalorg]

Current source files are displayed as plain text. Instead even they can be pretty printed/highlighted using pygments, because this is something I find myself doing again and again (i.e. reading source code in smurf).

Though this does seem out of the scope of a "markdown surfer".

[clinttepe]

Perhaps something like Rainbow JS could help? I've used it for code generation.