Provide some configurations for enabling/disabling some marked features

[thomasfr]

Sometimes you do not want to parse and convert all markdown into html.
Maybe someone do not want links,etc. to be parsed. node-discount does it this way.

Kind regards

[chjj]

This is a good idea. Something I've considered for a while: #5

I want to do it in a way that allows marked to be more hackable instead of adding options. I'll leave this open for now.

[chjj]

Although marked has become more extensible in the past year, it's still not perfect extensibility-wise.

Maybe someone do not want links

For example, if you don't want links parsed you could do:

marked.InlineLexer.rules.link = function() {};

This has been discussed in a lot of issues now, although this is one of the first issues that mentioned it, I'm going to close it for now. When this does happen it will be discussed.