Add ability to render HTML attributes on `h[1-6]` tags
[Experimental/Textile] Adds Textile-style header support
[Experimental/Textile] Adds Textile definition lists support
[Experimental/Textile] Note about Textile
Add ability to modify text before rendering HTML
Adds a new event named 'tag'
[Experimental/HtmlAttributes] Adds HTML attributes support

* Emmet style HTML attributes inside a curly braces
* Related Ticket is #16

See test/Ciconia/Resources/html/* to get the usage
Updates docs
Removed 1.1 features

See 1.1 milestone
[Experimental/Textile] Adds Textile comments support