Include headers of multiple levels in the guide content index

[bryntum]

Markdown defines the 1st level headers as headers with "===" under them and 2nd level - with "-------" (or with one "#" character in the beginning for 1st level and 2 "##" for 2nd level).

When creating the content index, JSDuck currently recognizes only the 2nd level headers.

Introduction
============
Ext Gantt allows you 

Basic features
==============

Weekends, highliting, skeep during DD

how to make it plain (no holidays at all)

Defining availability for individual days
=========================================

weekday, day override, week day override

parent - child

Availability for tasks
----------------------

Availability for resources
--------------------------

For example, for the text above the following content will be generated:

Would be great if it will also include 1st level headers in the content.

Thanks, Nickolay

[nene]

Thats intentional, because the first level header is intended as the title of the whole guide. It's supposed to be used only once - at the beginning of the guide.

[bryntum]

Hm.. Then perhaps a 3rd level headers could be included in the contents? Right now only 2nd level headers are included in the content, meanwhile its pretty common to have sections and sub-sections in the guides.

[nene]

Yeah, I guess that would be a reasonable thing to do.

Opening this issue back up, although not sure when I get to that...

[nene]

This has been fixed now with the addition of --guide-toc-level option.