Options to disable automatic header #ids

[tasty-tasty]

When we write in markdown file something like this:
### Heading

By default it will parse to:
<h3 id="Heading"><a href="#Heading" class="headerlink" title="Heading"></a>Heading</h3>

Marked parser has a feature to disable the automatic header ids in its advanced options, just set the "headerIds" to false and its ok.

So do we have something like this ?

marked:
  headerIds: false

Or what i need to do to render normal view Headings, like <h3>Heading</h3>, without ids, classes or inner links

[tasty-tasty]

Any ideas?

[tasty-tasty]

Guys, need any help to solving the problem.

[tomap]

I found the issue:
We replace
https://github.com/markedjs/marked/blob/aff0aa414e8334f824526ffb669674cdead3454e/lib/marked.js#L967
with our own
https://github.com/hexojs/hexo-renderer-marked/blob/master/lib/renderer.js#L17
but did not reproduce the test:
if (this.options.headerIds) {
So the option does not apply in our case.
I'll do a PR to fix that

[tomap]

Done #106
Please, review & validate